ci: Fix Firefox build on Windows #3991

Job	Run time
Build & test (ubuntu-latest, 1.76.0, debug)	14m 13s
Build & test (ubuntu-latest, stable, debug)	13m 43s
Build & test (ubuntu-latest, nightly-2024-09-01, debug)	12m 54s
Build & test (macos-14, 1.76.0, debug)	15m 23s
Build & test (macos-14, stable, debug)	9m 56s
Build & test (macos-14, nightly-2024-09-01, debug)	10m 55s
Build & test (windows-latest, 1.76.0, debug)	22m 41s
Build & test (windows-latest, stable, debug)	23m 0s
Build & test (windows-latest, nightly-2024-09-01, debug)	21m 22s
Build & test (ubuntu-latest, stable, release)	19m 18s
Benchmark / Benchmark	16m 39s
	3h 0m 4s

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