Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit c4cd29b7fbe3 · 2025-08-25T04:13:14.000Z
This updates the rust-version file to a1dbb44.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-425a9c0a0e365c0b8c6cfd00c2ded83a73bed9a0
+a1dbb443527bd126452875eb5d5860c1d001d761
