Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit 12c2c05a26a5 · 2025-12-13T13:27:26.000Z
This updates the rust-version file to ce63e5d.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-dfe1b8c97bcde283102f706d5dcdc3649e5e12e3
+ce63e5d9ea20f15a70c6fdc4d4de7aee352fd965
