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](pyca/service-identity@21.1.0...23.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>