chore(deps): update docker/setup-buildx-action digest to d70bba7 (#139)

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

.github/workflows/docker-publish.yml

@@ -39,7 +39,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@2b51285047da1547ffb1b2203d8be4c0af6b1f20
+        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action