Bump cdav-library from `0e508a5` to `4d3bbec`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `0e508a5` to `4d3bbec`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/0e508a5a9bdfd36197d562abfd0423c7bfbb3cb0...4d3bbec44c54cb5bb1877cc32ea53208f4a4bc39

)

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