fix(deps): update react monorepo to v19

Author: renovate[bot]

package.json

@@ -38,8 +38,8 @@
     "docusaurus-plugin-matomo": "0.0.8",
     "posthog-docusaurus": "^2.0.0",
     "prism-react-renderer": "^2.3.0",
-    "react": "^18.0.0",
-    "react-dom": "^18.0.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-github-btn": "^1.4.0",
     "typewriter-effect": "^2.21.0"
   },