Sort offline update items case-insensitively

Aleix Pol Gonzalezrequested to merge
work/cherry-pick-42aa91b2 into Plasma/6.3

Just like we sort online updates, which was implemented in a58ac127.

Inspired in Nate's patch.

BUG: 500661 CCBUG: 499638 FIXED-IN: 6.3.3

(cherry picked from commit 42aa91b2)

Co-authored-by: Nate Graham nate@kde.org

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