chore: update game bridge to 2.12.5 #976

Job	Run time
Test sample app 🛠️	2m 46s
Test Unity 6 sample app 🛠️	3m 5s
Build for WebGL	1s
Build for StandaloneWindows64	1s
Build for Android	1s
Build for iOS	1s
Build Unity 6 for ${{ matrix.targetPlatform }}	1s
	5m 56s

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