Update dependency aleksis-core to ~2.8

This MR contains the following updates:

Package	Type	Update	Change
aleksis-core (source)	dependencies	minor	~2.7 -> ~2.8

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Release Notes

AlekSIS/official/AlekSIS-Core

v2.8.1

Compare Source

Changed

* Official apps can now override any setting

v2.8

Compare Source

Changed

* Official apps can now override any setting

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