Verify stability

Run GitHub Actions for `8.2` and `8.3` (do not run for `8.0` and `8.1`) | closes #11 #77

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Run time

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Job	Run time
Validate (8.2)	31s
Validate (8.3)	31s
Validate (8.4)	16s
PHPStan	0s
PHPUnit	0s
	1m 18s