Declare getReflectionClass as covariant #490

Job	Run time
Platform test (8.0)	2m 39s
Platform test (8.2)	2m 41s
Platform test (7.4)	2m 54s
Platform test (8.4)	2m 28s
Platform test (8.1)	2m 44s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 16s
Platform test (8.3)	2m 38s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 42s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 25s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 33s
	26m 0s

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