remove deprecated config option of phpstan

[hana979]

When the following steps were followed to run phpstan, a deprecated warning was displayed.
So I remove deprecated config option of phpstan.neon.

composer install

./vendor/bin/phpstan --memory-limit=2G

Note: Using configuration file /xxx/pint/phpstan.neon.
⚠️  You're using a deprecated config option checkGenericClassInNonGenericObjectType ⚠️️

It's strongly recommended to remove it from your configuration file
and add the missing generic typehints.

If you want to continue ignoring missing typehints from generics,
add missingType.generics error identifier to your ignoreErrors:

parameters:
	ignoreErrors:
		-
			identifier: missingType.generics

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 [OK] No errors