build(deps): bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci-java11.yml

@@ -61,7 +61,7 @@ jobs:
       # BUILD
       # see https://github.com/eXist-db/exist/issues/4911
       - name: Build default images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile_j11
@@ -71,7 +71,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build debug images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: |
@@ -83,7 +83,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build nonroot images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: |
@@ -126,7 +126,7 @@ jobs:
       # Release
       - name: Push :dev6 to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -141,7 +141,7 @@ jobs:
 
       - name: Push :debug (dev6) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -158,7 +158,7 @@ jobs:
 
       - name: Push :nonroot (dev6) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64

.github/workflows/ci-java17.yml

@@ -59,7 +59,7 @@ jobs:
 
       # BUILD
       - name: Build default images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile
@@ -68,7 +68,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build debug images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: DISTRO_TAG=debug
@@ -78,7 +78,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build nonroot images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: |
@@ -120,7 +120,7 @@ jobs:
       # Latest
       - name: Push :latest to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -135,7 +135,7 @@ jobs:
 
       - name: Push :debug (latest) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -152,7 +152,7 @@ jobs:
 
       - name: push :nonroot (latest) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64

.github/workflows/ci-java8.yml

@@ -61,7 +61,7 @@ jobs:
       # BUILD
       # see https://github.com/eXist-db/exist/issues/4911
       - name: Build local images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: BRANCH=develop-6.x.x
@@ -71,7 +71,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build debug images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: |
@@ -83,7 +83,7 @@ jobs:
           cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/existdb:buildcache
 
       - name: Build nonroot images for testing on CI
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           build-args: |
@@ -117,7 +117,7 @@ jobs:
       # Release
       - name: Push :dev6 to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -132,7 +132,7 @@ jobs:
 
       - name: Push :debug (dev6) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64
@@ -149,7 +149,7 @@ jobs:
 
       - name: Push :nonroot (dev6) to Dockerhub
         if: github.ref == 'refs/heads/main'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./
           platforms: linux/amd64,linux/arm64