[deps]: Update docker/build-push-action action to v7 (#255)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -105,7 +105,7 @@ jobs:
 
       - name: Build Docker image
         id: build-docker
-        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6.9.0
+        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
         with:
           context: src/KeyConnector
           file: src/KeyConnector/Dockerfile