Bump docker/build-push-action from 6 to 7 (#1551)

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
...

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Author: dependabot[bot]

.github/workflows/docker.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v4
     - name: Build and export to Docker
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: "{{defaultContext}}:tools/archive_images"
         file: Dockerfile_gpsbabel_dev
@@ -34,7 +34,7 @@ jobs:
         docker exec -u "$(id -u):$(id -g)" -w /home/gpsbabel/gpsbabel-build "${container}" ./testo -p /usr/local/bin/gpsbabel
     - name: Build and push
       if: ( github.event_name == 'push' ) && ( github.ref == 'refs/heads/master' )
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: "{{defaultContext}}:tools/archive_images"
         file: Dockerfile_gpsbabel_dev