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

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

Author: adamkudrna

package-lock.json

@@ -29,8 +29,7 @@
     "url": "https://github.com/react-ui-org/react-ui"
   },
   "engines": {
-    "node": ">=20",
-    "npm": ">=10"
+    "node": ">=20"
   },
   "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": "^7.24.7",
@@ -93,6 +92,8 @@
     "postcss": "^8.4.39",
     "postcss-loader": "^8.1.1",
     "prop-types": "^15.8.1",
+    "react": "~18.2.0",
+    "react-dom": "~18.2.0",
     "sass": "^1.77.6",
     "sass-loader": "^14.2.1",
     "stylelint": "^16.7.0",