Add Symfony 7 support #178

Job	Run time
Code standards	18s
Composer lockfile integrity	12s
Tests (Symfony 5.4 & PHP 7.4)	26s
Tests (Symfony 5.4 & PHP 8.0)	23s
Tests (Symfony 6.0 & PHP 8.0)	26s
Tests (Symfony 5.4 & PHP 8.1)	23s
Tests (Symfony 6.0 & PHP 8.1)	32s
Tests (Symfony 6.1 & PHP 8.1)	31s
Tests (Symfony 6.2 & PHP 8.1)	28s
Tests (Symfony 6.3 & PHP 8.1)	28s
Tests (Symfony 6.4 & PHP 8.1)	23s
Tests (Symfony 5.4 & PHP 8.2)	24s
Tests (Symfony 6.0 & PHP 8.2)	24s
Tests (Symfony 6.1 & PHP 8.2)	33s
Tests (Symfony 6.2 & PHP 8.2)	24s
Tests (Symfony 6.3 & PHP 8.2)	32s
Tests (Symfony 6.4 & PHP 8.2)	30s
Tests (Symfony 7.0 & PHP 8.2)	23s
Tests (Symfony 5.4 & PHP 8.3)	26s
Tests (Symfony 6.0 & PHP 8.3)	8s
Tests (Symfony 6.1 & PHP 8.3)	1s
Tests (Symfony 6.2 & PHP 8.3)	2s
Tests (Symfony 6.3 & PHP 8.3)	1s
Tests (Symfony 6.4 & PHP 8.3)	1s
Tests (Symfony 7.0 & PHP 8.3)	1s
Tests (Symfony 5.4 & PHP 8.1)	31s
	8m 51s

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