fix(ci): install x264 for macos builds #288

Job	Run time
Packages and VS Code extension	26s
Build integration artifacts	2m 8s
Client lint, build, and tests	30s
Rust lint and unit tests	1m 41s
Android emulator integration	6m 2s
CLI simulator integration	1m 39s
JS API simulator integration	39s
	13m 5s

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