Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit c5e928d5ac9a · 2025-12-01T04:28:14.000Z
This updates the rust-version file to dfe1b8c.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-1be6b13be73dc12e98e51b403add4c41a0b77759
+dfe1b8c97bcde283102f706d5dcdc3649e5e12e3
