chore(deps): update dependency external/nextcloud-news to v28

[renovate]

This PR contains the following updates:

Package	Update	Change
external/nextcloud-news	major	26.1.0 → 28.1.0

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Release Notes

nextcloud/news (external/nextcloud-news)

v28.1.0

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Changed

• Re-implement custom explore source function, admins can configure a custom url where the app will search for feeds.{$langcode}.json (#​3609)
• Implement the cron check as a setup check, Admins need to check. (#​2831)
• DEV: update to phpunit 10 (#​3616)

v28.0.1

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Fixed

• Handle OPML files with leading blank lines (#​3596)
• Sanitize media descriptions to prevent potentially malicious HTML from untrusted feed content (#​3606)

v28.0.0

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Fixed

• Automatically select item when using single item route (#​3577)
• Scoped PHP dependencies are now correctly merged when multiple packages share the same namespace (e.g. league/uri + league/uri-interfaces, psr/http-factory + psr/http-message) (#​3580)

v27.2.0

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Changed

• Add support for svg feed logos (#​3425)

v27.1.0

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Changed

• Display categories at the end of an article (#​3380)

v27.0.1

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Fixed

• Latvian accented characters messed up (#​3363)

v27.0.0

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Changed

• Add option to enable/disable sync of a feed (#​3316)
• Add option to modify feeds from feed info table (#​3315)
• Open article from unified search result (#​3330)

Fixed

• fulltext scraper did not use new user agent (#​3320)
• fix feed url in search results (#​3329)

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