Bump webdav from 4.7.0 to 4.8.0

Bumps [webdav](https://github.com/perry-mitchell/webdav-client) from 4.7.0 to 4.8.0.
- [Release notes](https://github.com/perry-mitchell/webdav-client/releases)
- [Changelog](https://github.com/perry-mitchell/webdav-client/blob/master/CHANGELOG.md)
- [Commits](https://github.com/perry-mitchell/webdav-client/compare/v4.7.0...v4.8.0

)

---
updated-dependencies:
- dependency-name: webdav
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: nextcloud-command <nextcloud-command@users.noreply.github.com>