Update versions (in GitHub Actions workflow) and solve Symfony 6.x deprecations #146

Job	Run time
Code standards	17s
Composer lockfile integrity	10s
Tests (Symfony 4.4 & PHP 7.4)	35s
Tests (Symfony 5.0 & PHP 7.4)	23s
Tests (Symfony 5.1 & PHP 7.4)	30s
Tests (Symfony 5.2 & PHP 7.4)	26s
Tests (Symfony 5.3 & PHP 7.4)	34s
Tests (Symfony 5.4 & PHP 7.4)	25s
Tests (Symfony 4.4 & PHP 8.0)	32s
Tests (Symfony 5.1 & PHP 8.0)	27s
Tests (Symfony 5.2 & PHP 8.0)	25s
Tests (Symfony 5.3 & PHP 8.0)	32s
Tests (Symfony 5.4 & PHP 8.0)	23s
Tests (Symfony 6.0 & PHP 8.0)	31s
Tests (Symfony 4.4 & PHP 8.1)	30s
Tests (Symfony 5.3 & PHP 8.1)	30s
Tests (Symfony 5.4 & PHP 8.1)	31s
Tests (Symfony 6.0 & PHP 8.1)	24s
Tests (Symfony 6.1 & PHP 8.1)	28s
Tests (Symfony 6.2 & PHP 8.1)	31s
Tests (Symfony 6.3 & PHP 8.1)	23s
Tests (Symfony 4.4 & PHP 8.2)	31s
Tests (Symfony 5.3 & PHP 8.2)	26s
Tests (Symfony 5.4 & PHP 8.2)	34s
Tests (Symfony 6.0 & PHP 8.2)	36s
Tests (Symfony 6.1 & PHP 8.2)	36s
Tests (Symfony 6.2 & PHP 8.2)	24s
Tests (Symfony 6.3 & PHP 8.2)	34s
Tests (Symfony 5.4 & PHP 8.1)	29s
	13m 37s

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