Bump cdav-library from `f4ba45f` to `a41be4f`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `f4ba45f` to `a41be4f`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/f4ba45fec348c700bdc003cd0cb887e88429fa09...a41be4f7c4793ce9b681151ad33dc872989e701d

)

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