Bump cdav-library from `4109187` to `1940b5a`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `4109187` to `1940b5a`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/4109187754cbcb1d0d4fd710c75303b39f519f39...1940b5ab6f3f46d5fbe09cd12351f8b0fa0efc7e

)

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