Update gitignore for reindeer vendored registry
diff --git a/third-party/.cargo/.gitignore b/third-party/.cargo/.gitignore
index 9cc828a..5c5d3c3 100644
--- a/third-party/.cargo/.gitignore
+++ b/third-party/.cargo/.gitignore
@@ -1,2 +1,4 @@
 /.package-cache
+/.package-cache-mutate
 /config.toml
+/registry/