CI: Build on Ubuntu 20.04 for arm64 linux release #2007

Job	Run time
build-spidermonkey-win	15s
sdist	30s
build-spidermonkey-unix (ubuntu-22.04-arm, 3.10)	1m 54s
build-spidermonkey-unix (ubuntu-22.04, 3.10)	14s
build-spidermonkey-unix (macos-13, 3.10)	18s
build-spidermonkey-unix (macos-14, 3.10)	13s
build-and-test	0s
publish-archive	0s
publish-nightly	0s
publish	0s
	3m 24s

Provide feedback