Move online build to allowed-fail #1603

Job	Run time
sdist_verify	13s
docs / Load tox environments	5s
allowed-fail-tests / Load tox environments	9s
tests / Load tox environments	8s
docs / build_docs-notebooks (ubuntu-latest)	7m 3s
tests / py313 (ubuntu-latest)	4m 48s
tests / py312 (windows-latest)	6m 35s
tests / py311 (macos-latest)	5m 8s
tests / py311-oldestdeps (ubuntu-latest)	3m 31s
allowed-fail-tests / py312-online (ubuntu-latest)	10m 25s
allowed-fail-tests / py313-devdeps (ubuntu-latest)	5m 22s
publish / Build source and wheel distribution	3m 13s
notify	5s
	46m 45s

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