build(deps): bump submodules/rest-api-specs from ccfb412 to 2b4cec6 (#4812)

Bumps [submodules/rest-api-specs](https://github.com/Azure/azure-rest-api-specs) from `ccfb412` to `2b4cec6`.
- [Release notes](https://github.com/Azure/azure-rest-api-specs/releases)
- [Commits](Azure/azure-rest-api-specs@ccfb412...2b4cec6)

---
updated-dependencies:
- dependency-name: submodules/rest-api-specs
  dependency-version: 2b4cec68b918329b9dacee73cd8a1a6afe60315c
  dependency-type: direct:production
...

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