build(deps): bump submodules/rest-api-specs from 56b4c68 to 1e266b9 (#5298)

Bumps [submodules/rest-api-specs](https://github.com/Azure/azure-rest-api-specs) from `56b4c68` to `1e266b9`.
- [Release notes](https://github.com/Azure/azure-rest-api-specs/releases)
- [Commits](Azure/azure-rest-api-specs@56b4c68...1e266b9)

---
updated-dependencies:
- dependency-name: submodules/rest-api-specs
  dependency-version: 1e266b907c29660101d5c8293af2abb073413794
  dependency-type: direct:production
...

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