Removes [cacheable-request](https://github.com/jaredwray/cacheable-request). It's no longer used after updating ancestor dependency [gts](https://github.com/google/gts). These dependencies need to be updated together.


Removes `cacheable-request`

Updates `gts` from 3.1.0 to 3.1.1
- [Release notes](https://github.com/google/gts/releases)
- [Changelog](https://github.com/google/gts/blob/main/CHANGELOG.md)
- [Commits](https://github.com/google/gts/commits)

---
updated-dependencies:
- dependency-name: cacheable-request
  dependency-type: indirect
- dependency-name: gts
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

…and-gts--removed

…and-gts--removed