Rust

uefi: change `Fn` closure to `FnMut` #6826

Job	Run time
Integration Test (IA-32)	1m 33s
Integration Test (x86_64 Windows)	4m 53s
Unit + Doc Tests	47s
Build (stable MSRV)	37s
Integration Test (AArch64)	1m 17s
Integration Test (x86_64)	1m 25s
Build (uefi-raw MSRV)	30s
Nightly (build, test, doc)	2m 36s
Build (feature permutations)	3m 42s
Unit + Doc Tests (Miri)	1m 43s
Test Coverage	42s
Build Standard Binary (nightly)	31s
	20m 16s

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