Add pytest-asyncio to CI test dependencies

Fix CI test failures by installing pytest-asyncio in the GitHub Actions
workflow. The async recording service tests require this plugin to run.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: MarkoVcode

.github/workflows/test.yml

@@ -64,7 +64,7 @@ jobs:
         run: |
           cd benchmesh-serial-service
           pip install -r requirements.txt
-          pip install pytest
+          pip install pytest pytest-asyncio
 
       - name: Run Python tests
         run: |