chore(deps): update docker/setup-buildx-action digest to a946f06

Author: renovate[bot]

.github/workflows/build.yaml

@@ -33,7 +33,7 @@ jobs:
       # for caching of docker layers see:
       # https://evilmartians.com/chronicles/build-images-on-github-actions-with-docker-layer-caching
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@2dd22fa31c04297d369158eb483250f578504a9f
+        uses: docker/setup-buildx-action@a946f06b5ddbde456d0115dc585e8dc3c7a0c3e0
         with:
           install: true