chore: update game bridge to 2.12.5 #912

Job	Run time
Test sample app 🛠️	2m 4s
Test Unity 6 sample app 🛠️	4m 2s
Build for ${{ matrix.targetPlatform }}	0s
Build Unity 6 for iOS	5m 33s
Build Unity 6 for StandaloneWindows64	4m 58s
	16m 37s

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