update

Author: tgross35

library/compiler-builtins/crates/josh-sync/src/sync.rs

@@ -71,7 +71,7 @@ impl GitSync {
         self.run([
             "git",
             "fetch",
-            &self.josh_url(&self.upstream_repo, Some(&new_upstream_base), Some("/")),
+            &self.josh_url(&self.upstream_repo, Some(&new_upstream_base), Some(":/")),
             &new_upstream_base,
             "--depth=1",
         ]);