Update composer.json

Author: PDowney

composer.json

@@ -14,13 +14,13 @@
     "php": ">=7.4"
   },
   "require-dev": {
-    "phpunit/phpunit": "^12.2.7",
+    "phpunit/phpunit": "^9.5",
     "yoast/phpunit-polyfills": "^4.0",
     "wp-coding-standards/wpcs": "^3.1",
-    "dealerdirect/phpcodesniffer-composer-installer": "^1.1.1",
+    "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
     "php-stubs/wordpress-stubs": "^6.8",
-    "szepeviktor/phpstan-wordpress": "^2.0.2",
-    "phpstan/phpstan": "^2.1.17"
+    "szepeviktor/phpstan-wordpress": "^1.3",
+    "phpstan/phpstan": "^1.0"
   },
   "config": {
     "allow-plugins": {