Change minimum PHP version to 8.0 and introduce 8.3 #430

Job	Run time
Coding Standards (8.0, highest)	20s
Static Code Analysis (8.0, highest)	20s
Coding Standards (8.1, highest)	16s
Static Code Analysis (8.1, highest)	19s
Architecture analysis (8.0, highest)	13s
Coding Standards (8.2, highest)	17s
Tests (8.0, highest)	13s
Static Code Analysis (8.2, highest)	24s
Architecture analysis (8.1, highest)	14s
Static Code Analysis (8.3, highest)	19s
Tests (8.1, highest)	14s
Architecture analysis (8.2, highest)	14s
Tests (8.2, highest)	13s
Architecture analysis (8.3, highest)	15s
Tests (8.3, highest)	12s
	4m 3s

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