Bump service-identity from 21.1.0 to 23.1.0 (#2480)

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
...

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

requirements.txt

@@ -23,7 +23,7 @@ regex==2023.6.3
 requests==2.31.0
 retry==0.9.2
 riotwatcher==3.2.5
-service-identity==21.1.0 # for twisted SSL as well
+service-identity==23.1.0 # for twisted SSL as well
 SQLAlchemy==2.0.7
 SQLAlchemy-Utc==0.14.0
 tempora==5.3.0