Create 6.0.8 for mc1.21.1

Create 6.0.8:

Fix StockKeeperRequestScreen focusing search box if the chat key is pressed when typing in the address box
Fix signals not reacting to redstone input #9444
Fix held-item based menus not working correctly #9433
Fix z-fighting between elevators and walls
Fix crash with certain mods that add spawn eggs
Fix copycat blocks and other blocks depending on ModelData not being rendered correctly on contraptions when using indirect or instanced rendering #9410 (1.21.1)
Fix threshold switches not correctly counting empty slots #9420 (1.21.1)

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