fix(platform): regenerate openapi.json and fix flaky test teardown

- Regenerate openapi.json to include Pydantic v2 ValidationError fields
  (input, ctx) that were added after the Gemini Flash commit
- Wrap oauth_test.py session fixture teardown in try/except to handle
  RuntimeError when event loop is already closed during session shutdown

autogpt_platform/frontend/src/app/api/openapi.json

@@ -14932,7 +14932,9 @@
             "title": "Location"
           },
           "msg": { "type": "string", "title": "Message" },
-          "type": { "type": "string", "title": "Error Type" }
+          "type": { "type": "string", "title": "Error Type" },
+          "input": { "title": "Input" },
+          "ctx": { "type": "object", "title": "Context" }
         },
         "type": "object",
         "required": ["loc", "msg", "type"],