CI: use free runner in x86_64-msvc-ext

Author: marcoieni

src/ci/github-actions/jobs.yml

@@ -390,7 +390,7 @@ auto:
       HOST_TARGET: x86_64-pc-windows-msvc
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --enable-lld --save-toolstates=/tmp/toolstate/toolstates.json
       DEPLOY_TOOLSTATES_JSON: toolstates-windows.json
-    <<: *job-windows-8c
+    <<: *job-windows
 
   # Temporary builder to workaround CI issues
   # See <https://github.com/rust-lang/rust/issues/127883>