Bump rust-installer

Jon Gjengset · Jon Gjengset · commit 50e2509a6c97 · 2023-02-03T17:59:49.000-08:00
Makes generation of `manifest.in` deterministic: rust-lang/rust-installer#120
diff --git a/src/tools/rust-installer b/src/tools/rust-installer
@@ -1 +1 @@
-Subproject commit 5b2eee7eed72b4894909c5eecbf014ea0b5ad995
+Subproject commit 9981e4d1ea6ac0992ff21be5514d4230dc77548b
