[github] Change Ubuntu version to 22.04 #2065

Job	Run time
tc-gcc	29s
verilator	11s
check-control-registers	10s
riscv-isa-sim	6s
check-opcodes	3s
tc-llvm	56s
verilator-model (minpool)	6s
verilator-model (mempool)	5s
build-apps-gcc (minpool)	18s
build-apps-gcc (mempool)	23s
unit-test	2m 19s
check-bootrom	9s
build-apps-llvm (minpool)	29s
tc-halide	7s
build-apps-llvm (mempool)	36s
run-apps-gcc	0s
build-apps-halide (minpool)	1m 29s
build-apps-halide (mempool)	35s
run-apps-llvm	0s
run-apps-halide (minpool)	11s
run-apps-halide (mempool)	11s
clean-up	4s
clean-up-compile-runs (minpool)	2s
clean-up-compile-runs (mempool)	2s
	9m 1s

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