[github] Change Ubuntu version to 22.04 #2089

Job	Run time
check-opcodes	4s
tc-gcc	24s
riscv-isa-sim	8s
check-control-registers	21s
tc-llvm	48s
verilator	7s
verilator-model (minpool)	10s
verilator-model (mempool)	6s
build-apps-gcc (minpool)	1m 21s
build-apps-gcc (mempool)	1m 22s
check-bootrom	20s
unit-test	2m 1s
build-apps-llvm (minpool)	1m 34s
tc-halide	12s
build-apps-llvm (mempool)	1m 33s
build-apps-halide (minpool)	1m 17s
build-apps-halide (mempool)	37s
run-apps-gcc (minpool)	32s
run-apps-gcc (mempool)	2m 25s
run-apps-llvm (minpool)	29s
run-apps-llvm (mempool)	2m 25s
run-apps-halide (minpool)	40s
run-apps-halide (mempool)	3m 12s
clean-up-compile-runs (minpool)	2s
clean-up	5s
clean-up-compile-runs (mempool)	2s
	22m 17s

Provide feedback