CI: build on Ubuntu 18.04 #2010

Job	Run time
build-spidermonkey-win	15s
build-spidermonkey-unix (ubuntu-22.04-arm, 3.10)	19s
build-spidermonkey-unix (macos-14, 3.10)	13s
build-spidermonkey-unix (macos-13, 3.10)	23s
build-spidermonkey-unix (ubuntu-22.04, 3.10)	9s
sdist	28s
build-and-test	0s
publish	0s
publish-nightly	0s
publish-archive	0s
	1m 47s

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