Bump cacheable-request and ibm-openapi-validator in /tests

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


Removes `cacheable-request`

Updates `ibm-openapi-validator` from 0.58.2 to 0.97.3
- [Release notes](https://github.com/IBM/openapi-validator/releases)
- [Changelog](https://github.com/IBM/openapi-validator/blob/main/CHANGELOG.md)
- [Commits](https://github.com/IBM/openapi-validator/compare/[email protected]@0.97.3)

---
updated-dependencies:
- dependency-name: cacheable-request
  dependency-type: indirect
- dependency-name: ibm-openapi-validator
  dependency-type: direct:production
...

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