fix: update Electron version (#256)

The latest Theia 1.63 consumes Electron in version `36.4.0` so we need
to update too.

Author: sdirix

templates/app-electron-package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "@theia/cli": "<%= params.theiaVersion %>",
-    "electron": "^30.1.2"
+    "electron": "^36.4.0"
   },
   "scripts": {
     "bundle": "npm run rebuild && theia build --mode development",