Revert "Security: bump @babel/core and preset-env in demos to 7.29.0"

This reverts commit 7f4d688.

Author: aleksei-semikozov

apps/demos/package.json

@@ -90,9 +90,9 @@
     },
     "devDependencies": {
         "@angular/platform-server": "17.3.12",
-        "@babel/core": "7.29.0",
+        "@babel/core": "7.23.9",
         "@babel/eslint-parser": "catalog:eslint8",
-        "@babel/preset-env": "7.29.0",
+        "@babel/preset-env": "7.23.9",
         "@babel/preset-react": "^7.26.3",
         "@babel/preset-typescript": "^7.26.3",
         "@rollup/plugin-babel": "6.0.4",