chore: bump ppy.osu.Framework to 2026.503.7 #1968

Job	Run time
Code Quality	11m 38s
Build only (Android)	16m 31s
Build only (iOS)	3m 25s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	10m 23s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	59m 44s
Test (Windows, windows-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/...	17m 55s
Test (Windows, windows-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dl...	1h 14m 29s
Test results	11s
	3h 14m 16s

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