chore(deps): update dependency phpstan/phpstan to v1.6.9

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.6.8 -> 1.6.9

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Release Notes

phpstan/phpstan

v1.6.9

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Bugfixes

• Fix endless recursion with nested traits via anonymous classes (#​1303), #​7214, thanks @​herndlm!
• Support string accessory types in BitwiseNot (#​1266), thanks @​staabm!
• infer non-empty-string on substr() comparison with constant string (#​1259), #​6792, thanks @​staabm!
• Fix invalidating conditional expressions after ArrayDimFetch unset (https://github.com/phpstan/phpstan-src/commit/cc640d797c201b5de0ac00f8e1bdf22a5707928f)

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