Update dependency aleksis-core to v2.5

This MR contains the following updates:

Package	Type	Update	Change
aleksis-core (source)	dependencies	minor	2.4 -> 2.5

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Release Notes

AlekSIS/official/AlekSIS-Core

v2.5

Compare Source

Added

* Recursive helper methods for group hierarchies

Fixed

• Remove left-over reference to preferences in a form definition that caused form extensions in downstream apps to break
• Allow non-LDAP users to authenticate if LDAP is used with password handling
• Additional button on progress page for background tasks was shown even if the task failed.
• Register preference for available allowed oauth grants.

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