bump to Laravel 9

Author: aurawindsurfing

composer.json

@@ -12,7 +12,7 @@
     "homepage": "https://github.com/aurawindsurfing/slashremovemiddleware",
     "keywords": ["Laravel", "SlashRemoveMiddleware"],
     "require": {
-        "illuminate/support": "~5|~6|~7|~8"
+        "illuminate/support": "~5|~6|~7|~8|~9"
     },
     "require-dev": {
         "phpunit/phpunit": "~9.0",
@@ -25,7 +25,6 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Aurawindsurfing\\SlashRemoveMiddleware\\Tests\\": "tests"
         }
     },
     "extra": {