Update docker/setup-buildx-action digest to ba31df4 (#364)

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

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -48,7 +48,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@6a25f988bdfa969e96a38fc9f843ea31e0b5df27
+        uses: docker/setup-buildx-action@ba31df4664624f17e1b1ef1c9c85ed1ca9463a6d
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action