Bump cdav-library from `ee651f4` to `e534e12`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `ee651f4` to `e534e12`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/ee651f4f6c7c53140510ca165deac8e0d9373106...e534e12a7693d03ea34e26952b10af1aad19bc7e

)

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