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]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -73,7 +73,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Build and load
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: ${{ matrix.dir }}
         file: ${{ matrix.file }}
@@ -107,7 +107,7 @@ jobs:
 
     - name: Build and push
       id: build
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: ${{ matrix.dir }}
         file: ${{ matrix.file }}