Bump QEMU to 8.1.1 #309

Job	Run time
build (ubuntu-20.04, newlib, rv32gc-ilp32d, gcc)	2h 39m 48s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, llvm)	4h 27m 51s
test-sim (ubuntu-20.04, newlib, rv64gc-lp64d, spike)	2h 44m 17s
build (ubuntu-20.04, newlib, rv64gc-lp64d, gcc)	2h 41m 14s
build (ubuntu-20.04, newlib, rv64gc-lp64d, llvm)	3h 14m 49s
build-multilib	0s
build (ubuntu-20.04, linux, rv32gc-ilp32d, gcc)	4h 6m 45s
build (ubuntu-20.04, linux, rv32gc-ilp32d, llvm)	3h 38m 15s
build (ubuntu-20.04, linux, rv64gc-lp64d, gcc)	5h 8m 12s
build (ubuntu-20.04, linux, rv64gc-lp64d, llvm)	4h 13m 2s
build (ubuntu-20.04, musl, rv64gc-lp64d, gcc)	52m 6s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, gcc)	57m 32s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, llvm)	4h 6m 35s
build (ubuntu-22.04, newlib, rv64gc-lp64d, gcc)	1h 11m 15s
build (ubuntu-22.04, newlib, rv64gc-lp64d, llvm)	3h 40m 48s
build (ubuntu-22.04, linux, rv32gc-ilp32d, gcc)	1h 6m 20s
build (ubuntu-22.04, linux, rv32gc-ilp32d, llvm)	4h 35m 7s
build (ubuntu-22.04, linux, rv64gc-lp64d, gcc)	1h 9m 54s
build (ubuntu-22.04, linux, rv64gc-lp64d, llvm)	3h 58m 35s
build (ubuntu-22.04, musl, rv64gc-lp64d, gcc)	47m 4s
	2d 7h 19m 29s

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