Bump axios and pm2 in /traffic_portal/app/src (apache#7920)

Removes [axios](https://github.com/axios/axios). It's no longer used after updating ancestor dependency [pm2](https://github.com/Unitech/pm2). These dependencies need to be updated together.


Removes `axios`

Updates `pm2` from 5.2.2 to 5.3.1
- [Release notes](https://github.com/Unitech/pm2/releases)
- [Changelog](https://github.com/Unitech/pm2/blob/master/CHANGELOG.md)
- [Commits](Unitech/pm2@5.2.2...v5.3.1)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: pm2
  dependency-type: direct:production
...

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traffic_portal/app/src/package.json

@@ -5,7 +5,7 @@
         "connect-timeout": "1.9.0",
         "express": "4.19.2",
         "morgan": "1.10.0",
-        "pm2": "5.2.2",
+        "pm2": "5.3.1",
         "requirejs": "2.3.6",
         "ssl-root-cas": "1.3.1"
     }