Merge pull request #15328 from docker-library-bot/external-pins-moby

Update moby/buildkit:buildx-stable-1

.external-pins/moby/buildkit___buildx-stable-1

@@ -1 +1 @@
-sha256:d91fe5e6dad11f2c2cee6d268d5843ad64bf2e9852365d56b12d02f2315edce5
+sha256:890dcae054e3039f6c6b76bf0da80a130fa6e6bb1f3624063ef0210ac2c57b06