ci: Further tweaks to building NSS #1631

Job	Run time
Build & test (ubuntu-latest, 1.74.0, debug)	6m 30s
Build & test (ubuntu-latest, stable, debug)	5m 43s
Build & test (ubuntu-latest, nightly, debug)	5m 41s
Build & test (macos-14, 1.74.0, debug)	6m 58s
Build & test (macos-14, stable, debug)	5m 28s
Build & test (macos-14, nightly, debug)	6m 13s
Build & test (windows-latest, 1.74.0, debug)	12m 0s
Build & test (windows-latest, stable, debug)	13m 42s
Build & test (windows-latest, nightly, debug)	11m 43s
Build & test (ubuntu-latest, stable, release)	8m 18s
Benchmark / Benchmark	8m 48s
	1h 31m 4s

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