ci: force rustup proxy on PATH for macos-14 x86_64 builds #3888

Job	Run time
TypeScript type check	7m 12s
Rust compile check	56s
Verify dynamic imports	10s
Lint	6m 41s
Security audit	7m 11s
Native host build (windows-latest)	5m 4s
Native host build (ubuntu-latest)	3m 18s
Native host build (macos-latest)	2m 40s
Pre-publish benchmark gate	11m 4s
Test Node 22 (macos-latest)	11m 44s
Engine parity (macos-latest)	6m 52s
Test Node 22 (windows-latest)	15m 16s
Engine parity (windows-latest)	13m 7s
Engine parity (ubuntu-latest)	6m 26s
Test Node 22 (ubuntu-latest)	9m 5s
CI Testing Pipeline	4s
	1h 46m 50s

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