ci: force rustup proxy on PATH for macos-14 x86_64 builds #3907

Job	Run time
Rust compile check	1m 7s
TypeScript type check	7m 32s
Verify dynamic imports	7s
Security audit	6m 38s
Native host build (ubuntu-latest)	3m 27s
Native host build (macos-latest)	3m 39s
Lint	6m 24s
Native host build (windows-latest)	6m 22s
Pre-publish benchmark gate	10m 56s
Engine parity (ubuntu-latest)	6m 45s
Engine parity (macos-latest)	9m 17s
Engine parity (windows-latest)	11m 53s
Test Node 22 (windows-latest)	14m 20s
Test Node 22 (macos-latest)	11m 36s
Test Node 22 (ubuntu-latest)	9m 25s
CI Testing Pipeline	3s
	1h 49m 31s

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