Skip DocumentManagerTypeInferenceTest on PHP8+ #472

Job	Run time
Platform test (8.0)	2m 54s
Platform test (8.2)	2m 56s
Platform test (8.3)	3m 2s
Platform test (7.4)	2m 24s
Platform test (8.1)	2m 33s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 15s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 31s
Platform test (8.4)	2m 33s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 28s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 17s
	25m 53s

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