Bump cdav-library from `2a22abc` to `5a3f90a`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `2a22abc` to `5a3f90a`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/2a22abc3c49d682262c853713a8cd48a0ec360b1...5a3f90ae7bb813d4b16d9ddda2023349803abe28

)

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