build(deps): bump submodules/rest-api-specs from c521eaa to c88a450 (#4901)

Bumps [submodules/rest-api-specs](https://github.com/Azure/azure-rest-api-specs) from `c521eaa` to `c88a450`.
- [Release notes](https://github.com/Azure/azure-rest-api-specs/releases)
- [Commits](Azure/azure-rest-api-specs@c521eaa...c88a450)

---
updated-dependencies:
- dependency-name: submodules/rest-api-specs
  dependency-version: c88a450be637a3776e4aa9a6f8ce00c6ad991165
  dependency-type: direct:production
...

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