chore(deps): update dependency phpstan/phpstan to v1.4.8

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.4.7 -> 1.4.8

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Release Notes

phpstan/phpstan

v1.4.8

Compare Source

Improvements 🔧

• Validate ignoreErrors regexes during DIC compilation (save time in each run) (https://github.com/phpstan/phpstan-src/commit/692158c194eff722167f5316d31369a188a88a72), #​6693
• Validate parametersSchema only during DIC compilation (https://github.com/phpstan/phpstan-src/commit/50f25e95ad2f99d9fb73e512ac9b54599653305b)
• Retain left and right types in == and === expression (#​1046), thanks @​herndlm!
• Add support for integer ranges in strtotime() with constant strings (#​1045), thanks @​Seldaek!

Bugfixes 🐛

• Fix is_subclass_of with same class (#​1044), #​6305, thanks @​herndlm!
• Fix Incorrectly nested style tag found for narrow terminals (https://github.com/phpstan/phpstan-src/commit/d921d067702acb1cc0451753dcdf3be142b29aed), #​6724, #​6727
• Empty array infers key and value type as never (https://github.com/phpstan/phpstan-src/commit/c2b9e713daa09db18111d28ba5c8cd79beeaeec5), #​3400, #​6353, #​5757, #​5065
• ArrayType::traverse() - create empty ConstantArrayType in case of never (https://github.com/phpstan/phpstan-src/commit/8c1dfc1afb3f381c8e50befe38e8abc581c67db2)

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