Merge pull request #3315 from slimphp/dependabot/composer/squizlabs/php_codesniffer-tw-3.9

Update squizlabs/php_codesniffer requirement from ^3.8 to ^3.9

Author: l0gicgate

composer.json

@@ -68,7 +68,7 @@
         "phpunit/phpunit": "^9.6",
         "slim/http": "^1.3",
         "slim/psr7": "^1.6",
-        "squizlabs/php_codesniffer": "^3.8"
+        "squizlabs/php_codesniffer": "^3.9"
     },
     "autoload": {
         "psr-4": {