build(deps): bump docker/build-push-action from 6 to 7

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/builder-images.yml

@@ -98,7 +98,7 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build Image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: Dockerfile.builder

.github/workflows/redis.yml

@@ -48,7 +48,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build No Push
         if: ${{ github.event_name == 'pull_request' }}
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: docker/redis/Dockerfile
@@ -57,7 +57,7 @@ jobs:
       - name: Build and push by digest
         if: ${{ github.event_name != 'pull_request' }}
         id: build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: docker/redis/Dockerfile

.github/workflows/reusable-kumomta-build.yml

@@ -211,7 +211,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build Image
         id: build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           push: ${{ github.event_name != 'pull_request' }}
           platforms: ${{ inputs.docker_platform }}