Bump cdav-library from `4f88368` to `eac2cf7`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `4f88368` to `eac2cf7`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/4f883682ecf74595938dd47fbce28e4072324f93...eac2cf72fe0ab579247dff4254046067970bc442

)

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