Bump actions/checkout from 3 to 4 (#185)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci_build.yaml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: repo checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: check
         run: |
           .github/scripts/check_projects.sh theories
@@ -34,7 +34,7 @@ jobs:
         id: cpu-cores
 
       - name: repo checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Initialise variables
         run: |

.github/workflows/docker.yaml

@@ -16,7 +16,7 @@ jobs:
       id-token: write
     steps:
     - name: repo checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: container registry log in
       uses: docker/login-action@v3