ci: force rustup proxy on PATH for macos-14 x86_64 builds #3927

Job	Run time
Lint	6m 50s
Verify dynamic imports	5s
Rust compile check	58s
Security audit	6m 41s
Native host build (macos-latest)	4m 24s
Native host build (ubuntu-latest)	3m 49s
Native host build (windows-latest)	6m 6s
TypeScript type check	5m 26s
Pre-publish benchmark gate	11m 42s
Engine parity (macos-latest)	11m 18s
Test Node 22 (macos-latest)	13m 49s
Test Node 22 (ubuntu-latest)	10m 11s
Engine parity (windows-latest)	11m 13s
Engine parity (ubuntu-latest)	6m 14s
Test Node 22 (windows-latest)	17m 16s
CI Testing Pipeline	4s
	1h 56m 6s

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