Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit 430ec291a0ba · 2025-11-27T06:58:36.000Z
This updates the rust-version file to 1be6b13.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-d3e1ccdf40ae7b7a6dc81edc073d80dad7b66f75
+1be6b13be73dc12e98e51b403add4c41a0b77759
