Bump service-identity from 21.1.0 to 23.1.0 (#16038)

Bumps [service-identity](https://github.com/pyca/service-identity) from 21.1.0 to 23.1.0.
- [Release notes](https://github.com/pyca/service-identity/releases)
- [Changelog](https://github.com/pyca/service-identity/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pyca/service-identity/compare/21.1.0...23.1.0

)

---
updated-dependencies:
- dependency-name: service-identity
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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