ci: Speed up NSS build with `sccache` #3995

Job	Run time
Build & test (ubuntu-latest, 1.76.0, debug)	2m 13s
Build & test (ubuntu-latest, stable, debug)	2m 13s
Build & test (ubuntu-latest, nightly-2024-09-01, debug)	2m 13s
Build & test (macos-14, 1.76.0, debug)	2m 13s
Build & test (macos-14, stable, debug)	2m 13s
Build & test (macos-14, nightly-2024-09-01, debug)	2m 14s
Build & test (windows-latest, 1.76.0, debug)	2m 2s
Build & test (windows-latest, stable, debug)	2m 4s
Build & test (windows-latest, nightly-2024-09-01, debug)	2m 3s
Build & test (ubuntu-latest, stable, release)	2m 11s
Benchmark	1s
	21m 40s

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