Bump cdav-library from `85dc947` to `8134baa`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `85dc947` to `8134baa`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/85dc947f27c554e5cc8caa460ebe361cf6775bb9...8134baaf6fa5292399f6bb147668048c09a84dea

)

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