Bump docker/build-push-action from 6 to 7 (#441)

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -110,7 +110,7 @@ jobs:
           fi
       - name: Build and push by digest
         id: build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: asterisk
           platforms: ${{ matrix.target.platform }}