fix: eliminate storyboard atlas overflow GPU stalls + bump framework to 2026.503.7 #1969

Job	Run time
Code Quality	12m 23s
Build only (iOS)	6m 46s
Build only (Android)	17m 32s
Test (Windows, windows-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/...	27m 3s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	57m 20s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	10m 8s
Test (Windows, windows-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dl...	1h 13m 23s
Test results	11s
	3h 24m 46s

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