Bump actions/cache from 2.1.5 to 2.1.6 (#118)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.5...v2.1.6)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/new-base-image-requested.yml

@@ -60,7 +60,7 @@ jobs:
             exit 1
           fi
       - name: Cache Docker layers
-        uses: actions/[email protected].5
+        uses: actions/[email protected].6
         with:
           path: /tmp/.buildx-cache
           key: ${{ github.event.client_payload.repoVersionFull }}-${{ runner.os }}-buildx-base-${{ github.sha }}

.github/workflows/new-hub-image-requested.yml

@@ -60,7 +60,7 @@ jobs:
             exit 1
           fi
       - name: Cache Docker layers
-        uses: actions/[email protected].5
+        uses: actions/[email protected].6
         with:
           path: /tmp/.buildx-cache
           key: ${{ github.event.client_payload.repoVersionFull }}-${{ runner.os }}-buildx-hub-${{ github.sha }}

.github/workflows/pull-requests.yml

@@ -133,7 +133,7 @@ jobs:
         with:
           driver-opts: network=host
       - name: Cache Docker layers
-        uses: actions/[email protected].5
+        uses: actions/[email protected].6
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-pr-${{ matrix.targetPlatform }}-${{ github.sha }}