Add testbench 9 and pest 2 (#9)

Author: maantje

.gitignore

@@ -1,3 +1,4 @@
 /node_modules
 /vendor
 .phpunit.result.cache
+.phpunit.cache

composer.json

@@ -24,8 +24,8 @@
         }
     },
     "require-dev": {
-        "orchestra/testbench": "^7.20|^8.0",
-        "pestphp/pest": "^1.22"
+        "orchestra/testbench": "^7.20 || ^8.0 || ^9.0",
+        "pestphp/pest": "^1.20 || ^2.0"
     },
     "config": {
         "allow-plugins": {