Bump @types/node from 18.16.3 to 20.3.2 in /impl/baseline

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 18.16.3 to 20.3.2.
- [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>

impl/baseline/package.json

@@ -8,7 +8,7 @@
   },
   "devDependencies": {
     "@bufbuild/buf": "^1.23.1",
-    "@types/node": "^18.16.3",
+    "@types/node": "^20.3.2",
     "tsx": "^3.12.7",
     "typescript": "^5.0.4"
   }