Rust

uefi: change `Fn` closure to `FnMut` #6824

Job	Run time
Integration Test (AArch64)	1m 31s
Integration Test (x86_64)	1m 37s
Integration Test (x86_64 Windows)	3m 52s
Build (stable MSRV)	45s
Unit + Doc Tests	52s
Unit + Doc Tests (Miri)	1m 29s
Integration Test (IA-32)	1m 26s
Build (feature permutations)	4m 16s
Nightly (build, test, doc)	2m 18s
Build (uefi-raw MSRV)	38s
Build Standard Binary (nightly)	37s
Test Coverage	37s
	19m 58s

Provide feedback