Merge pull request #259 from slimphp/dependabot/composer/phpstan/phpstan-tw-1.5

Update phpstan/phpstan requirement from ^1.4 to ^1.5

Author: l0gicgate

composer.json

@@ -42,7 +42,7 @@
     "php-http/psr7-integration-tests": "dev-master",
     "phpspec/prophecy": "^1.15",
     "phpspec/prophecy-phpunit": "^2.0",
-    "phpstan/phpstan": "^1.4",
+    "phpstan/phpstan": "^1.5",
     "phpunit/phpunit": "^9.5",
     "squizlabs/php_codesniffer": "^3.6"
   },