Bump axios and actions-on-google in /src

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


Removes `axios`

Updates `actions-on-google` from 2.13.0 to 3.0.0
- [Release notes](https://github.com/actions-on-google/actions-on-google-nodejs/releases)
- [Changelog](https://github.com/actions-on-google/actions-on-google-nodejs/blob/master/CHANGELOG.md)
- [Commits](actions-on-google/actions-on-google-nodejs@v2.13.0...3.0.0)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: actions-on-google
  dependency-type: direct:production
...

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