chore(deps): update docker/build-push-action action to v7 (#1559)

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

Author: renovate[bot]

.github/workflows/build-outline-role-sync.yml

@@ -72,7 +72,7 @@ jobs:
             type=raw,value=release,enable=${{ github.event_name == 'release' }}
 
       - name: Build and push image
-        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6.19.2
+        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
         with:
           context: ./services/outline-role-sync
           platforms: linux/amd64