Bump @types/node from 18.17.14 to 18.18.1 in /webapp

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 18.17.14 to 18.18.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

webapp/package.json

@@ -15,7 +15,7 @@
     "@testing-library/user-event": "^14.4.3",
     "@types/dompurify": "^3.0.1",
     "@types/jest": "^29.5.0",
-    "@types/node": "^18.15.11",
+    "@types/node": "^18.18.1",
     "@types/react": "^18.0.35",
     "@types/react-dom": "^18.0.11",
     "date-fns": "^2.30.0",