3a36ca03e4
test_extensions' test_ext_cine extension has the same upgrade hazard as test_ext7: the regression test leaves it in an updated state from which no downgrade path to default is provided. This causes the update_extensions.sql script helpfully provided by pg_upgrade to fail. So drop it in cross-version-upgrade testing. Not entirely sure how come I didn't hit this in testing yesterday; possibly I'd built the upgrade reference databases with testmodules-install-check disabled. Backpatch to v10 where this module was introduced.
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