Bump moto from 5.1.20 to 5.1.21 (#2210)

Bumps [moto](https://github.com/getmoto/moto) from 5.1.20 to 5.1.21.
- [Release notes](https://github.com/getmoto/moto/releases)
- [Changelog](https://github.com/getmoto/moto/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getmoto/moto/compare/5.1.20...5.1.21)

---
updated-dependencies:
- dependency-name: moto
  dependency-version: 5.1.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -98,7 +98,7 @@ hypothesis = "^6.151.5"
 honcho = "*"
 isort = "^7.0.0"
 jinja2-cli = {version = "==1.0.0", extras = ["yaml"]}
-moto = "==5.1.20"
+moto = "==5.1.21"
 pip-audit = "*"
 pre-commit = "^4.5.1"
 pytest = "^9.0.2"