[github] Change Ubuntu version to 22.04 #2075

Job	Run time
tc-gcc	25s
check-control-registers	24s
check-opcodes	6s
riscv-isa-sim	11s
tc-llvm	58s
verilator	11s
verilator-model (minpool)	11s
verilator-model (mempool)	6s
build-apps-gcc (minpool)	33s
check-bootrom	15s
build-apps-gcc (mempool)	34s
unit-test	2m 0s
tc-halide	12s
build-apps-llvm (minpool)	1m 29s
build-apps-llvm (mempool)	1m 22s
run-apps-gcc	0s
build-apps-halide (minpool)	39s
build-apps-halide (mempool)	36s
run-apps-halide (minpool)	32s
run-apps-halide (mempool)	3m 8s
run-apps-llvm	0s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	4s
clean-up	5s
	14m 3s

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