Support Symfony 6 and drop Symfony 4 and PHP < 8.1 #380

Job	Run time
Coding Standards (PHP8.1 \| Deps: highest)	1m 12s
Dependency Analysis (PHP8.1 \| Deps: highest \| SF^5.4)	1m 34s
Dependency Analysis (PHP8.1 \| Deps: highest \| SF^6.3)	1m 29s
Dependency Analysis (PHP8.2 \| Deps: highest \| SF^5.4)	1m 13s
Code Coverage (PHP8.2 \| Deps: highest)	1m 58s
Dependency Analysis (PHP8.2 \| Deps: highest \| SF^6.3)	1m 9s
Static Code Analysis (PHP8.1 \| Deps: highest \| SF^5.4)	1m 38s
Integration tests (PHP8.1 \| Deps: highest \| SF^5.4)	1m 50s
Static Code Analysis (PHP8.1 \| Deps: highest \| SF^6.3)	1m 28s
Integration tests (PHP8.1 \| Deps: highest \| SF^6.3)	1m 10s
Unit tests (PHP8.1 \| Deps: highest \| SF^5.4)	1m 5s
Static Code Analysis (PHP8.2 \| Deps: highest \| SF^5.4)	1m 43s
Integration tests (PHP8.2 \| Deps: highest \| SF^5.4)	1m 34s
Unit tests (PHP8.1 \| Deps: highest \| SF^6.3)	1m 3s
Integration tests (PHP8.2 \| Deps: highest \| SF^6.3)	1m 10s
Static Code Analysis (PHP8.2 \| Deps: highest \| SF^6.3)	1m 56s
Unit tests (PHP8.2 \| Deps: highest \| SF^5.4)	1m 7s
Unit tests (PHP8.2 \| Deps: highest \| SF^6.3)	1m 2s
	25m 21s

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