Bump axios and @serverless/platform-client in /api/comments-service

Bumps [axios](https://github.com/axios/axios) and @serverless/platform-client. These dependencies needed to be updated together.

Updates `axios` from 0.21.4 to 1.6.2
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v0.21.4...v1.6.2)

Updates `@serverless/platform-client` from 4.3.2 to 4.5.1

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: "@serverless/platform-client"
  dependency-type: indirect
...

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