Increase CI supported versions (#30) #32

Job	Run time
Tests / Fetch supported versions	7s
Tests / Static analysis	27s
Tests / Bare minimum	16s
Tests / Late migration - PHP	24s
Tests / Up to date versions	7m 7s
Tests / Bare minimum - Special case - Symfony 5.4	21s
Tests / Up to date versions - Special case - Symfony 5.4	6m 13s
Tests / Late migration - Symfony	3m 50s
Tests / Nightly - PHP - With highest supported Symfony versions	23s
Tests / Nightly - Symfony - With lowest supported PHP version	14s
Tests / Nightly - Symfony - With highest supported PHP version	14s
Tests / Nightly - PHP - With lowest supported Symfony versions	18s
	19m 54s

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