Bump cdav-library from `d77d03e` to `e12e386`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `d77d03e` to `e12e386`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/d77d03e55eeffd7c7b184d18685726bb74aad8e2...e12e386576268007a38744cc10d9c4361d6367e7

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