fix: use stable ci proxy domain #448

Job	Run time
Rust lint and unit tests	1m 7s
Build integration artifacts	2m 44s
Client lint, build, and tests	34s
Packages and VS Code extension	30s
Android emulator integration	6m 21s
CLI simulator integration	9m 32s
WebRTC stream benchmark	5m 13s
JS API simulator integration	4m 3s
	30m 4s

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