Update dependency phpstan/phpstan-symfony to v1.3.6

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan-symfony	require-dev	patch	1.3.5 -> 1.3.6

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Release Notes

phpstan/phpstan-symfony (phpstan/phpstan-symfony)

v1.3.6

Compare Source

• 34b3c43 - Fix CacheInterface::get() return type

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