Bump QEMU to v8.1.0 #292

Job	Run time
test-sim (ubuntu-20.04, newlib, rv64gc-lp64d, spike)	1h 42m 23s
build-multilib	0s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, gcc)	2h 55m 57s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, llvm)	3h 5m 9s
build (ubuntu-20.04, newlib, rv64gc-lp64d, gcc)	2h 22m 22s
build (ubuntu-20.04, newlib, rv64gc-lp64d, llvm)	3h 14m 3s
build (ubuntu-20.04, linux, rv32gc-ilp32d, gcc)	3h 33m 36s
build (ubuntu-20.04, linux, rv32gc-ilp32d, llvm)	3h 9m 11s
build (ubuntu-20.04, linux, rv64gc-lp64d, gcc)	4h 43m 29s
build (ubuntu-20.04, linux, rv64gc-lp64d, llvm)	3h 8m 45s
build (ubuntu-20.04, musl, rv64gc-lp64d, gcc)	48m 42s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, gcc)	57m 8s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, llvm)	3h 32m 15s
build (ubuntu-22.04, newlib, rv64gc-lp64d, gcc)	52m 36s
build (ubuntu-22.04, newlib, rv64gc-lp64d, llvm)	2h 45m 45s
build (ubuntu-22.04, linux, rv32gc-ilp32d, gcc)	57m 23s
build (ubuntu-22.04, linux, rv32gc-ilp32d, llvm)	2h 55m 35s
build (ubuntu-22.04, linux, rv64gc-lp64d, gcc)	1h 1m 26s
build (ubuntu-22.04, linux, rv64gc-lp64d, llvm)	2h 58m 32s
build (ubuntu-22.04, musl, rv64gc-lp64d, gcc)	48m 44s
	1d 21h 33m 1s

Provide feedback