[github] Change Ubuntu version to 22.04 #2085

Job	Run time
tc-llvm	56s
check-control-registers	21s
verilator	6s
check-opcodes	4s
riscv-isa-sim	6s
tc-gcc	23s
verilator-model (minpool)	5s
verilator-model (mempool)	6s
check-bootrom	11s
build-apps-gcc (minpool)	1m 27s
unit-test	2m 17s
build-apps-gcc (mempool)	1m 29s
build-apps-llvm (minpool)	1m 15s
build-apps-llvm (mempool)	1m 13s
tc-halide	6s
build-apps-halide (minpool)	36s
build-apps-halide (mempool)	39s
run-apps-halide (minpool)	32s
run-apps-halide (mempool)	2m 57s
run-apps-gcc (minpool)	45s
run-apps-gcc (mempool)	2m 20s
run-apps-llvm	0s
clean-up	3s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	2s
	18m 1s

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