Bump cdav-library from `21937a6` to `0d82618`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `21937a6` to `0d82618`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/21937a683f77863411039bb183f5552cce3b1471...0d826181fdb3958ad7ec214fc00b450edb55a866

)

---
updated-dependencies:
- dependency-name: cdav-library
  dependency-type: direct:production
...

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