fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - react from 18.3.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react
  - react-dom from 18.3.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/richb-hanover/project/e0fe7ef4-f1e5-43c4-aed1-ae68c94e56e9?utm_source=github&utm_medium=referral&page=upgrade-pr

web/playground/package.json

@@ -19,8 +19,8 @@
     "@testing-library/user-event": "^14.5.0",
     "monaco-editor": "^0.49.0",
     "prql-js": "file:../../prqlc/bindings/js",
-    "react": "^18.2.0",
-    "react-dom": "^18.3.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
     "react-syntax-highlighter": "^15.5.0",
     "web-vitals": "^4.1.0",
     "yaml": "^2.4.0"