Add Symfony 7 support #177

Job	Run time
Code standards	18s
Composer lockfile integrity	29s
Tests (Symfony 5.4 & PHP 7.4)	26s
Tests (Symfony 5.4 & PHP 8.0)	30s
Tests (Symfony 6.0 & PHP 8.0)	35s
Tests (Symfony 5.4 & PHP 8.1)	23s
Tests (Symfony 6.0 & PHP 8.1)	33s
Tests (Symfony 6.1 & PHP 8.1)	33s
Tests (Symfony 6.2 & PHP 8.1)	33s
Tests (Symfony 6.3 & PHP 8.1)	27s
Tests (Symfony 6.4 & PHP 8.1)	27s
Tests (Symfony 5.4 & PHP 8.2)	29s
Tests (Symfony 6.0 & PHP 8.2)	34s
Tests (Symfony 6.1 & PHP 8.2)	28s
Tests (Symfony 6.2 & PHP 8.2)	25s
Tests (Symfony 6.3 & PHP 8.2)	33s
Tests (Symfony 6.4 & PHP 8.2)	27s
Tests (Symfony 7.0 & PHP 8.2)	37s
Tests (Symfony 5.4 & PHP 8.3)	28s
Tests (Symfony 6.0 & PHP 8.3)	1s
Tests (Symfony 6.1 & PHP 8.3)	1s
Tests (Symfony 6.2 & PHP 8.3)	1s
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)	30s
	9m 51s

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