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](docker/build-push-action@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>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
       - name: Build Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false

.github/workflows/security_scanning.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Build CI container
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           tags: 'ci/puppet-catalog-diff-viewer:${{ github.sha }}'
           push: false