fix: upgrade @types/node from 20.4.2 to 20.5.9

Snyk has created this PR to upgrade @types/node from 20.4.2 to 20.5.9.

See this package in npm:
https://www.npmjs.com/package/@types/node

See this project in Snyk:
https://app.snyk.io/org/qdraw/project/4885c835-1cac-4a15-bd27-a17cd26960bf?utm_source=github&utm_medium=referral&page=upgrade-pr

starsky/starsky/clientapp/package.json

@@ -10,7 +10,7 @@
     "@testing-library/user-event": "^13.5.0",
     "@types/jest": "^27.5.2",
     "@types/leaflet": "^1.9.2",
-    "@types/node": "^20.4.2",
+    "@types/node": "^20.5.9",
     "@types/reach__router": "^1.3.11",
     "@types/react": "^18.2.15",
     "@types/react-dom": "^18.2.7",