xtask: Update OVMF prebuilts #5841

Job	Run time
Integration Test (IA-32)	1m 36s
Integration Test (x86_64)	1m 25s
Integration Test (AArch64)	1m 33s
Integration Test (x86_64 Windows)	5m 0s
Build (feature permutations)	3m 26s
Build (stable MSRV)	26s
Build Standard Binary (nightly)	32s
Lints	1m 12s
Unit + Doc Tests (Miri)	1m 4s
Nightly (build, test, doc)	3m 4s
Unit + Doc Tests	1m 44s
Test Coverage	51s
	21m 53s

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