[BC] Add sf 7.0 and drop 4.4 (#34) #56

Job	Run time
Tests / Fetch supported versions	4s
Tests / Static analysis	27s
Tests / PHP 8.4 & Sf 6.4 - Up to date versions - Sf 6.4 case	7m 22s
Tests / PHP 8.0 & Sf 5.4 - Bare minimum	19s
Tests / PHP 8.4 & Sf 7.0 - Up to date versions	6m 39s
Tests / PHP 8.4 & Sf 5.4 - Late Symfony migration	6m 0s
Tests / PHP 8.1 & Sf 6.4 - Bare minimum - Sf 6.4 case	23s
Tests / PHP 8.2 & Sf 7.0 - Late PHP migration	19s
Tests / Nightly - PHP 8.5 & Sf 7.0 - PHP with highest supported Symfony versions	15s
Tests / Nightly - PHP 8.4 & Sf 7.1 - Symfony with highest supported PHP version	16s
Tests / Nightly - PHP 8.2 & Sf 7.1 - Symfony with lowest supported PHP version	14s
Tests / Nightly - PHP 8.5 & Sf 5.4 - PHP with lowest supported Symfony versions	18s
	22m 36s

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