Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit cfc73b5c9424 · 2025-09-08T04:10:15.000Z
This updates the rust-version file to 2f3f27b.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-a1dbb443527bd126452875eb5d5860c1d001d761
+2f3f27bf79ec147fec9d2e7980605307a74067f4
