Bump @types/node from 18.19.0 to 20.14.6 in /lib/js

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 18.19.0 to 20.14.6.
- [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:development
  update-type: version-update:semver-major
...

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

lib/js/package.json

@@ -13,7 +13,7 @@
     "@babel/preset-typescript": "^7.16.0",
     "@types/fhir": "^0.0.35",
     "@types/jest": "^29.2.0",
-    "@types/node": "^18.x",
+    "@types/node": "^20.x",
     "jest": "^29.2.2",
     "prettier": "^2.4.1",
     "ts-node": "^10.4.0",