chore(deps): update dependency phpstan/phpstan to v1.6.8

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.6.7 -> 1.6.8

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Release Notes

phpstan/phpstan

v1.6.8

Compare Source

Bugfixes 🐛

• Support narrowing types via in_array() for enum cases (#​1291), #​7176, thanks @​herndlm!
• Fix checking of generic attributes (https://github.com/phpstan/phpstan-src/commit/361e064d4b92119fb98bb96143a2b3bd4105dd90), #​7171, #​7208

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