chore(deps): update dependency phpstan/phpstan to v1.5.6

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.5.4 -> 1.5.6

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Release Notes

phpstan/phpstan

v1.5.6

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This release enables to write forward-compatible custom rules with PHPStan 1.6.0+Bleeding Edge. Detailed instructions are here: https://phpstan.org/blog/preprocessing-ast-for-custom-rules

• Allow registering of custom rich parser node visitors (https://github.com/phpstan/phpstan-src/commit/b0dafcc4921bb6e3b0e5db5065b4989c3b350bab)

v1.5.5

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Improvements

• Remove unnecessary ConstantArrayType::getKeyType() (#​1173), thanks @​herndlm!
• Improve ConstantArrayType union performance (#​1176), thanks @​herndlm!
• Do not evaluate constructors as having side effects by default, Handle side effects of constructors in new (#​1205), thanks @​VasekPurchart!

Bleeding edge

• Specify explicit mixed array type via is_array (#​1191), thanks @​herndlm!

If you want to see the shape of things to come and adopt bleeding edge features early, you can include this config file in your project's phpstan.neon:

includes:
	- vendor/phpstan/phpstan/conf/bleedingEdge.neon

Of course, there are no backwards compatibility guarantees when you include this file. The behaviour and reported errors can change in minor versions with this file included. Learn more

Bugfixes

• Fix curl_getinfo($ch, CURLINFO_CONTENT_TYPE) (#​1170), #​6929, thanks @​oschwald!
• Fix return types for bcdiv(), bcmod(), bcpowmod() and bcsqrt() in PHP 8.0 and higher (#​1152), #​5134, thanks @​W0rma!
• Add support for int and bool args for strlen() (#​1162), thanks @​fluffycondor!
• Add support for float and null for strlen(), improve support for booleans (#​1199), thanks @​fluffycondor!
• Feature/undefined expression allowed (#​1174), #​6107, #​5971, #​5337, #​6899, thanks @​rajyan!
• Fix/coalesce simulate ternary (#​1193), thanks @​rajyan!
• Support variadic parameter in array_replace (#​1209), #​7020, thanks @​herndlm!
• ObjectType - fix imprecise cache key issue (https://github.com/phpstan/phpstan-src/commit/ee934468b707f46d0416bba7b89cc33d3a0d7cd7), #​6944
• Fix int overflow internal error (https://github.com/phpstan/phpstan-src/commit/c5d0902d2b3fbf8f00913002f9ba72b6caa929a0), #​6979

Function signature fixes

• DOMText::splitText() may return false (#​1180), thanks @​xPaw!
• Collator creation function/method can return null (#​1182), thanks @​finwe!
• Fix return signature of SplObjectStorage methods (#​1185), thanks @​Furgas!
• Fix return signature of SimpleXMLElement::getDocNamespaces (#​1190), thanks @​Furgas!

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