ci(deps): bump docker/build-push-action in the ci-dependencies group

Bumps the ci-dependencies group with 1 update: [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `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
  dependency-group: ci-dependencies
...

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

.github/workflows/publish.yml

@@ -34,7 +34,7 @@ jobs:
         password: ${{ secrets.REGISTRY_PASSWORD }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         build-args: |
           "PYTHON_VERSION=${{ matrix.python-version }}"

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
         password: ${{ secrets.REGISTRY_PASSWORD }}
 
     - name: Build Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         build-args: |
           "PYTHON_VERSION=${{ matrix.python-version }}"