updating installer to fix install issues on bitrig

diff --git a/src/rust-installer b/src/rust-installer
index e54d4823d26cdb3f98e5a1b17e1c257cd329aa61..8e4f8ea581502a2edc8177a040300e05ff7f91e3 160000 (submodule)
--- a/src/rust-installer
+++ b/src/rust-installer
@@ -1 +1 @@
-Subproject commit e54d4823d26cdb3f98e5a1b17e1c257cd329aa61
+Subproject commit 8e4f8ea581502a2edc8177a040300e05ff7f91e3