Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit 63cdf9310e41 · 2025-12-16T03:59:09.000Z
This updates the rust-version file to cec7008.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-ce63e5d9ea20f15a70c6fdc4d4de7aee352fd965
+cec70080fd441d16e9fb08a0d1d1a04c72d1ed25
