chore(deps): update dependency phpstan/phpstan-phpunit to v1.3.8

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan-phpunit	require-dev	patch	1.3.4 -> 1.3.8

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Release Notes

phpstan/phpstan-phpunit

v1.3.8

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• 4a19a3c - Add tip to error when a not fully qualified name is seen in @​covers annotation.

v1.3.7

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• 7e43c8f - Fix handling assertInstanceOf

v1.3.6

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• 4b17a23 - Fix MockMethodCallRule

v1.3.5

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• abc2da9 - Fix build
• db436df - Do not use instanceof *Type
• c5ace3a - Merge commit 'd77af96' into 1.1.x
• 75f87d4 - Fix build
• 87516ff - Require PHPStan 1.10

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