[CI] update Ubuntu 20.04 to 22.04, and use upload-artifact@v4. #21

Job	Run time
build-llvm (ubuntu-22.04, Release)	37m 21s
build-llvm (ubuntu-latest, Release)	40m 16s
build-llvm (macos-13, Release)	37m 34s
build-llvm (macos-14, Release)	17m 37s
build-clang (ubuntu-22.04, Release)	1s
test-llvm-z80 (ubuntu-22.04, Release)	1s
build-clang (ubuntu-latest, Release)	1s
test-llvm	0s
test-llvm-z80 (ubuntu-latest, Release)	1s
build-clang (macos-13, Release)	1s
test-llvm-z80 (macos-13, Release)	1s
build-clang (macos-14, Release)	1s
test-llvm-z80 (macos-14, Release)	1s
nightly	0s
test-clang	0s
	2h 12m 56s

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