chore: update game bridge to prelease-2.12.6-alpha.7 #1005

Job	Run time
Test sample app 🛠️	3m 4s
Test Unity 6 sample app 🛠️	4m 0s
Build for iOS	3m 56s
Build for WebGL	7m 47s
Build for Android	11m 56s
Build for StandaloneWindows64	3m 53s
Build Unity 6 for iOS	5m 29s
Build Unity 6 for StandaloneWindows64	5m 22s
	45m 27s

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