Port to 1.21.3

Available in 1.21.3 With some minor issues mostly about GUI that don't affect usability: - Search box blinking - Text in some tooltips not shown - ... Changes: - Port to Minecraft 1.21.3 - Upgrade gradle to 8.11.1 - Upgrade fabric loader to 0.16.9 - Upgrade fabric api to 0.110.0+1.21.3 - Upgrade fabric-loom to 1.8.13