chore(deps): update dependency phpstan/phpstan to v1.5.4

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.5.3 -> 1.5.4

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Release Notes

phpstan/phpstan

v1.5.4

Compare Source

Bugfixes

• Support named arguments when resolving template parameters (#​1151), #​5262, thanks @​rvanvelzen!
• Various fixes for constant arrays (#​1154), #​4308, #​6965, #​6961, #​6383, #​5933, #​5382, #​6379, #​3284
• Fix for arrays not being accepted when having an accessory type (https://github.com/phpstan/phpstan-src/commit/843ebbb1d889ac4d9a152a52f1f1ee9690d2e721), #​6552
• Avoid describing ConstantArrayType values twice (#​1168, #​1169), thanks @​herndlm!
• Fix false positive UnhandledMatchError throw point (#​1165), #​6910, thanks @​rajyan!
• Fix in_array() bug (https://github.com/phpstan/phpstan-src/commit/0ae28f761b2e0d473224aded78960d3d96b4e31e)
• Various optimization attempts (https://github.com/phpstan/phpstan-src/commit/91c7507787b4a9a63568562cda35644f139460c2, https://github.com/phpstan/phpstan-src/commit/5400b5858ef1750ede656dffc894acbbbc228e88, https://github.com/phpstan/phpstan-src/commit/c4c64fe6dae985d196aea92f3b7eca40e70c7ef4)

Function signature fixes

• added show_source() signature, an alias of highlight_file() (#​1160), thanks @​staabm!
• more precise getenv() signature (#​1161), thanks @​staabm!

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