manifest: update zephyr-lang-rust to always link runtime libs first

Update zephyr-lang-rust module to include commit for linking the
runtime library before the librustapp.a.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

submanifests/optional.yaml

@@ -34,7 +34,7 @@ manifest:
       groups:
         - optional
     - name: zephyr-lang-rust
-      revision: d2734f48d3ab1dbf584a936b2a05ece7bf0904f5
+      revision: f20afb5bae9a4b64332a230a734c0244b39d4035
       path: modules/lang/rust
       remote: upstream
       groups: