fix: update template annotations to remove covariant keyword #255

Job	Run time
Platform test (8.3)	3m 21s
Platform test (7.4)	3m 28s
Platform test (8.0)	3m 12s
Platform test (8.1)	3m 10s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 55s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 59s
Platform test (8.4)	3m 14s
Platform test (8.2)	3m 4s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 41s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 57s
	31m 1s

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