Fetch 'trunk' branch - not 'restore-msvc' branch

Author: jmid

.github/workflows/msvc-common.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: ocaml/ocaml
-          ref: restore-msvc
+          ref: trunk
           path: ocaml
           submodules: true