Bump moto from 5.0.20 to 5.0.21 (#1339)

Bumps [moto](https://github.com/getmoto/moto) from 5.0.20 to 5.0.21.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](getmoto/moto@5.0.20...5.0.21)

---
updated-dependencies:
- dependency-name: moto
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]