EntityRepository.stub fix nullability in findOneBy #213

Job	Run time
Platform test (7.4)	2m 47s
Platform test (8.0)	4m 58s
Platform test (8.1)	3m 13s
Platform test (8.2)	2m 42s
Platform test (8.3)	3m 10s
Platform test (8.4)	3m 0s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 49s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 37s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 37s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 58s
	30m 51s

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