docker-buildx: 0.6.2 -> 0.6.3

pkgs/applications/virtualization/docker/buildx.nix

···
 
 buildGoModule rec {
   pname = "docker-buildx";
-  version = "0.6.2";
+  version = "0.6.3";
 
   src = fetchFromGitHub {
     owner = "docker";
     repo = "buildx";
     rev = "v${version}";
-    sha256 = "sha256-X/oTL/CfMunGcS3HDoH/g1gZcJWnVU93OkcGC36KuA4=";
+    sha256 = "sha256-UKIT3PfybuQjKxxFbRQSCA8G3R2xIySWEDUKg27u5Rk=";
   };
 
   vendorSha256 = null;