Bump docker/build-push-action from 4.0.0 to 6.8.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.0.0 to 6.8.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4.0.0...v6.8.0)

---
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/publish-docker.yml

@@ -30,7 +30,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4.0.0
+        uses: docker/build-push-action@v6.8.0
         with:
           context: devops
           build-args: PYTHON_VERSION=${{ matrix.python_version }}
@@ -60,7 +60,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4.0.0
+        uses: docker/build-push-action@v6.8.0
         with:
           context: devops
           build-args: MSSQL_VERSION=${{ matrix.mssql_version }}