Restrict React version to 18.2.x to prevent tests from failing due to…

… deprecation warnings

Also, remove npm from "engines" as it is not an engine.

package.json

@@ -29,8 +29,7 @@
     "url": "https://github.com/react-ui-org/react-ui"
   },
   "engines": {
-    "node": ">=18",
-    "npm": ">=9"
+    "node": ">=18"
   },
   "scripts": {
     "build": "webpack --mode=production && webpack --mode=development",
@@ -54,8 +53,8 @@
   },
   "peerDependencies": {
     "prop-types": "^15.8.0",
-    "react": "^18.0.0",
-    "react-dom": "^18.0.0"
+    "react": "~18.2.0",
+    "react-dom": "~18.2.0"
   },
   "devDependencies": {
     "@babel/cli": "^7.22.10",
@@ -93,6 +92,8 @@
     "postcss": "^8.4.29",
     "postcss-loader": "^7.3.3",
     "prop-types": "^15.8.1",
+    "react": "~18.2.0",
+    "react-dom": "~18.2.0",
     "sass": "^1.66.1",
     "sass-loader": "^13.3.2",
     "stylelint": "^16.7.0",