Bump docker/build-push-action from 5 to 6 (#31)

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

.github/workflows/build.yaml

@@ -83,7 +83,7 @@ jobs:
 
       - name: Build and push OCI amd64 image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
@@ -109,7 +109,7 @@ jobs:
 
       - name: Build and push OCI arm64 image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
@@ -135,7 +135,7 @@ jobs:
 
       - name: Build and push OCI ppc64le image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
@@ -161,7 +161,7 @@ jobs:
 
       - name: Build and push OCI s390x image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}