fix: only require react-dom 16

Author: Loïc Mangeonjean

package.json

@@ -43,7 +43,7 @@
     "deep-equal": "^2.2.3",
     "lodash.debounce": "^4.0.8",
     "monaco-editor": "npm:@codingame/monaco-vscode-editor-api@^26.0.1",
-    "react-dom": ">=18.3.1",
+    "react-dom": ">=16.0.0",
     "vscode": "npm:@codingame/monaco-vscode-extension-api@^26.0.1"
   },
   "devDependencies": {