Fix codecov on PRs (microsoft#60174)

Author: jakebailey

.github/workflows/ci.yml

@@ -97,7 +97,7 @@ jobs:
 
       - uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
         with:
-          use_oidc: true
+          use_oidc: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork) }}
           disable_search: true
           files: ./coverage/codecov.json