Update docker/setup-buildx-action digest to d70bba7

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -76,7 +76,7 @@ jobs:
       - name: Setup Docker buildx
         id: buildx
         timeout-minutes: 4
-        uses: docker/setup-buildx-action@2b51285047da1547ffb1b2203d8be4c0af6b1f20
+        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb
       - name: Log into registry
         timeout-minutes: 5
         uses: docker/login-action@e92390c5fb421da1463c202d546fed0ec5c39f20