Upgrade Codecov action to v6 - #852

Bugbot Analysis Progress (49s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (47s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_d80b8f53-3da7-4216-9929-4810681f57c0