chore: drop support for Symfony 4.4 and PHP 7.4, as they are not maintained since a long time #140

Job	Run time
cypress	54s
static_analysis	23s
test (8.1, --prefer-stable --prefer-lowest)	26s
test (8.1)	28s
test (8.2)	38s
test (8.3, true, --coverage-text)	1m 27s
test (8.1, 5.*)	34s
test (8.2, 5.4.*)	37s
test (8.3, 5.4.*)	27s
test (8.1, 6.4.*)	23s
test (8.2, 6.4.*)	24s
test (8.3, 6.4.*)	21s
test (8.2, 7.0.*)	38s
test (8.3, 7.0.*)	20s
test (8.3, 7.*, dev)	3m 37s
	11m 37s

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