Rollup merge of #107656 - jonhoo:bump-rust-installer, r=Mark-Simulacrum

Bump rust-installer

Makes generation of `manifest.in` deterministic:
https://github.com/rust-lang/rust-installer/pull/120

diff --git a/src/tools/rust-installer b/src/tools/rust-installer
index 5b2eee7eed72b4894909c5eecbf014ea0b5ad995..9981e4d1ea6ac0992ff21be5514d4230dc77548b 160000 (submodule)
--- a/src/tools/rust-installer
+++ b/src/tools/rust-installer
@@ -1 +1 @@
-Subproject commit 5b2eee7eed72b4894909c5eecbf014ea0b5ad995
+Subproject commit 9981e4d1ea6ac0992ff21be5514d4230dc77548b