Update docker/build-push-action action to v6.19.0 (#514)

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

Author: renovate[bot]

.github/workflows/docker.yml

@@ -41,7 +41,7 @@ jobs:
 
       - name: build+push
         if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+        uses: docker/build-push-action@ee4ca427a2f43b6a16632044ca514c076267da23 # v6.19.0
         with:
           platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
           push: ${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}