Update buildx action version

Author: mikehaller

.github/workflows/docker-build-publish-seatadjuster.yml

@@ -55,7 +55,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
+        uses: docker/setup-buildx-action@v2
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action