Bump cdav-library from `8134baa` to `766d32a`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `8134baa` to `766d32a`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/8134baaf6fa5292399f6bb147668048c09a84dea...766d32afbac90dbcb8af1e42afb93c16cfae50e3

)

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