Merge pull request #199 from slimphp/dependabot/composer/phpstan/phpstan-tw-1.8

Update phpstan/phpstan requirement from ^1.7 to ^1.8

Author: l0gicgate

composer.json

@@ -45,7 +45,7 @@
         "laminas/laminas-diactoros": "^2.11",
         "nyholm/psr7": "^1.5",
         "php-http/psr7-integration-tests": "dev-master",
-        "phpstan/phpstan": "^1.7",
+        "phpstan/phpstan": "^1.8",
         "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.7"
     },