GH Actions: run integration tests against Composer snapshot #163
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Proposed Changes
Run integration tests against Composer snapshot for a limited set of builds to get early warning of upcoming changes we need to be aware of.
It has already been announced that Composer 2.3 will drop support for PHP < 7.2 and there may be more breaking changes, so seeing test failures early would seem a good thing (both to fix things in the plugin, if needs be, as well as to report issues with the next version of Composer upstream).