Bump com.github.bitfireAT:dav4jvm from 2.1.3 to 2.2.1

Bumps [com.github.bitfireAT:dav4jvm](https://github.com/bitfireAT/dav4jvm) from 2.1.3 to 2.2.1.
- [Release notes](https://github.com/bitfireAT/dav4jvm/releases)
- [Changelog](https://github.com/bitfireAT/dav4jvm/blob/main/CHANGELOG.md)
- [Commits](https://github.com/bitfireAT/dav4jvm/compare/2.1.3...2.2.1

)

---
updated-dependencies:
- dependency-name: com.github.bitfireAT:dav4jvm
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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