Bump animal-sniffer-maven-plugin from 1.17 to 1.21

Bumps [animal-sniffer-maven-plugin](https://github.com/mojohaus/animal-sniffer) from 1.17 to 1.21.
- [Release notes](https://github.com/mojohaus/animal-sniffer/releases)
- [Commits](https://github.com/mojohaus/animal-sniffer/compare/animal-sniffer-parent-1.17...animal-sniffer-parent-1.21)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:animal-sniffer-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>