Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit f54139aa310b · 2025-10-06T04:13:15.000Z
This updates the rust-version file to 4fa824b.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-9f32ccf35fb877270bc44a86a126440f04d676d0
+4fa824bb78318a3cba8c7339d5754b4909922547
