tests: use ubuntu-22.04 with Python 3.14-dev #1576

Job	Run time
build (pypy3.8, wikipedia, test, test.wikipedia.org)	2m 40s
build (pypy3.10, wikipedia, test, test.wikipedia.org)	2m 29s
build (3.8, wikipedia, test, test.wikipedia.org)	2m 10s
build (3.9, wikipedia, test, test.wikipedia.org)	2m 9s
build (3.10, wikipedia, test, test.wikipedia.org)	2m 7s
build (3.11, wikipedia, test, test.wikipedia.org)	2m 4s
build (3.12, wikipedia, test, test.wikipedia.org)	2m 8s
build (3.13, wikipedia, test, test.wikipedia.org)	2m 18s
build (3.14-dev, wikipedia, test, test.wikipedia.org)	3m 28s
build (3.8, wpbeta, en, en.wikipedia.beta.wmflabs.org)	1m 24s
build (3.8, wpbeta, zh, zh.wikipedia.beta.wmflabs.org)	1m 24s
	24m 21s

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