fix(deps): update react monorepo to v19 (#99)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jan-Hendrik Spahn <jan-hendrik.spahn@soptim.de>

Author: renovate[bot]

docs/package-lock.json

@@ -23,8 +23,8 @@
     "@mdx-js/react": "^3.0.0",
     "clsx": "^2.1.1",
     "prism-react-renderer": "^2.4.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1"
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@docusaurus/module-type-aliases": "3.10.1",