[github] Change Ubuntu version to 22.04 #2061

Job	Run time
check-opcodes	4s
check-control-registers	9s
riscv-isa-sim	7s
tc-gcc	24s
tc-llvm	56s
verilator	6s
verilator-model (minpool)	6s
verilator-model (mempool)	6s
build-apps-gcc (minpool)	16s
unit-test	2m 7s
build-apps-gcc (mempool)	18s
check-bootrom	9s
run-apps-gcc	0s
build-apps-llvm (minpool)	30s
tc-halide	10s
build-apps-llvm (mempool)	32s
build-apps-halide (minpool)	45s
build-apps-halide (mempool)	1m 19s
run-apps-llvm	0s
run-apps-halide (minpool)	14s
run-apps-halide (mempool)	19s
clean-up	7s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	2s
	8m 48s

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