chore: upgrade to Node.js v14.9.0 (#25249)

package.json

@@ -5,7 +5,7 @@
   "description": "Build cross platform desktop apps with JavaScript, HTML, and CSS",
   "devDependencies": {
     "@electron/docs-parser": "^0.9.1",
-    "@electron/typescript-definitions": "^8.7.8",
+    "@electron/typescript-definitions": "^8.7.9",
     "@octokit/rest": "^18.0.3",
     "@primer/octicons": "^10.0.0",
     "@types/basic-auth": "^1.1.3",
@@ -16,7 +16,7 @@
     "@types/express": "^4.17.7",
     "@types/fs-extra": "^9.0.1",
     "@types/mocha": "^7.0.2",
-    "@types/node": "^12.12.6",
+    "@types/node": "^14.6.2",
     "@types/semver": "^7.3.3",
     "@types/send": "^0.14.5",
     "@types/split": "^1.0.0",