Bump cdav-library from `c27587a` to `37cfc37`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `c27587a` to `37cfc37`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/c27587a4fdb318d10ef329548d146755964e6672...37cfc379b050deff8cb15407d5652098c350bff0

)

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