Bump leafo/gh-actions-lua from 8 to 12 #30

Job	Run time
test-on-windows (windows-latest, 3.12.2, https://mirrors.huaweicloud.com/python/)	1m 14s
test-on-linux (ubuntu-latest, 3.12.2, https://mirrors.huaweicloud.com/python/)	2m 4s
test-on-linux (ubuntu-latest, 3.12.2)	2m 1s
test-on-windows (windows-latest, 3.12.2)	1m 19s
	6m 38s

Provide feedback