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](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/build-push-image-matomo.yml

@@ -38,7 +38,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: matomo-ansible/docker/images/matomo
         file: matomo-ansible/docker/images/matomo/Dockerfile

.github/workflows/build-push-image-mta.yml

@@ -39,7 +39,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: matomo-ansible/docker/images/mta
         file: matomo-ansible/docker/images/mta/Dockerfile

.github/workflows/build-push-image-nginx.yml

@@ -38,7 +38,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: matomo-ansible/docker/images/nginx
         file: matomo-ansible/docker/images/nginx/Dockerfile