Bump Node version to v20.9.0

Author: github-actions[bot]

extensions/ql-vscode/.nvmrc

@@ -1 +1 @@
-v18.18.2
+v20.9.0

extensions/ql-vscode/package-lock.json

@@ -14,7 +14,7 @@
   },
   "engines": {
     "vscode": "^1.82.0",
-    "node": "^18.18.2",
+    "node": "^20.9.0",
     "npm": ">=7.20.6"
   },
   "categories": [
@@ -2039,7 +2039,7 @@
     "@types/jest": "^29.5.12",
     "@types/js-yaml": "^4.0.6",
     "@types/nanoid": "^3.0.0",
-    "@types/node": "18.18.*",
+    "@types/node": "20.9.*",
     "@types/node-fetch": "^2.5.2",
     "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.0",