fix(deps): update dependency @nextcloud/files to ^3.1.0 (stable28)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nextcloud/files	^3.0.0 -> ^3.1.0

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Release Notes

nextcloud-libraries/nextcloud-files (@​nextcloud/files)

v3.1.0

Compare Source

Enhancements

• enh(dav): Allow to set custom headers when creating the DAV client by @​susnux in https://github.com/nextcloud-libraries/nextcloud-files/pull/849

Fixed

• fix(Node): Handle slash as root path for public webdav endpoint by @​susnux in https://github.com/nextcloud-libraries/nextcloud-files/pull/847
• fix(dav): davResultToNode real owner by @​skjnldsv in https://github.com/nextcloud-libraries/nextcloud-files/pull/862

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