[github] Change Ubuntu version to 22.04 #2067

Job	Run time
check-control-registers	19s
riscv-isa-sim	8s
tc-gcc	24s
verilator	8s
tc-llvm	49s
check-opcodes	6s
verilator-model (minpool)	10s
verilator-model (mempool)	12s
check-bootrom	12s
build-apps-gcc (minpool)	28s
build-apps-gcc (mempool)	28s
unit-test	2m 20s
tc-halide	8s
build-apps-llvm (minpool)	54s
build-apps-llvm (mempool)	1m 1s
run-apps-gcc	0s
build-apps-halide (minpool)	36s
build-apps-halide (mempool)	36s
run-apps-halide (minpool)	33s
run-apps-halide (mempool)	3m 11s
run-apps-llvm	0s
clean-up	2s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	3s
	12m 50s

Provide feedback