fix(deps): bump @nextcloud/auth from 2.5.3 to ^2.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@nextcloud/auth	^2.5.3 → ^2.6.0

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Release Notes

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

v2.6.0

Compare Source

Added

• feat: add setRequestToken and fetchRequestToken methods (#​900)

Changed

• Bump @nextcloud/event-bus to 3.3.3
• chore: use correct package metadata (#​924)
• chore: revert ESLint to v9 to fix linter (#​901)
• chore: update Node and NPM dev versions to align with apps (#​854)
• ci: update all workflow templates from organization template repository (#​918)

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