Prepare for merging from rust-lang/rust

The rustc-josh-sync Cronjob Bot · The rustc-josh-sync Cronjob Bot · commit 7d378192a7d0 · 2025-07-31T04:16:57.000Z
This updates the rust-version file to 32e7a4b.
diff --git a/src/doc/rustc-dev-guide/rust-version b/src/doc/rustc-dev-guide/rust-version
@@ -1 +1 @@
-2b5e239c6b86cde974b0ef0f8e23754fb08ff3c5
+32e7a4b92b109c24e9822c862a7c74436b50e564
