Bump socket.io and zappajs

Bumps [socket.io](https://github.com/socketio/socket.io) to 2.5.1 and updates ancestor dependency [zappajs](https://github.com/zappajs/zappajs). These dependencies need to be updated together.


Updates `socket.io` from 0.9.16 to 2.5.1
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/2.5.1/CHANGELOG.md)
- [Commits](https://github.com/socketio/socket.io/commits/2.5.1)

Updates `zappajs` from 0.4.22 to 6.5.0
- [Commits](https://github.com/zappajs/zappajs/commits/v6.5.0)

---
updated-dependencies:
- dependency-name: socket.io
  dependency-type: indirect
- dependency-name: zappajs
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]