Update to 26.3

[goncalo3]

Updates mc-update from 26.3-pre-1 to the 26.3 release.

Changes

• Minecraft 26.3, Fabric Loader 0.19.5, Fabric API 0.161.0+26.3
• Sodium mc26.3-0.9.2, Lithium mc26.3-0.26.1, Iris 1.11.6+26.3 and ModMenu 21.0.0
• Util.getPlatform().openUri(String) was removed in 26.3; its call sites now use Blaze3D.openUri(URI.create(...))
• ClientLevel#addBreakingBlockEffect was split into addBreakingBlockEffects, addBreakingParticles and playBreakingSound. NoRender's block particle hook now targets addBreakingParticles, so the breaking sound still plays
• Fix a crash in ScreenMixin#onKeyPressed when a key is pressed while the game is starting. 26.3 pumps input events from the Minecraft constructor, before Meteor has initialized

Testing

• Checked every mixin target (including the Sodium, Lithium, Iris, Indigo, ViaFabricPlus and Baritone ones) and the class tweaker entries against the 26.3 jars
• Launched into a singleplayer world on 26.3 with Sodium, Lithium, Iris and Baritone (from 26.3 baritone#15)

Notes

• baritone is still 26.1-SNAPSHOT, since there's no 26.3 build on the Meteor maven yet (see 26.3 baritone#15)
• URI.create throws on a malformed URL, where the old openUri(String) only logged it. This only matters for URLs that come from addons (the website button in the commits screen)
• I also have master merged into mc-update with the conflicts resolved (mostly from the GLFW to InputConstants migration), and can open that as a separate PR if it's useful