Fix dependabot gripe about unused package.json templates with old electron.

Author: jdillick

.core/.cli/commands/electron/builder/template/package.json

@@ -50,7 +50,7 @@
   "license": "CC0-1.0",
   "devDependencies": {
     "cross-env": "^5.2.0",
-    "electron": "^2.0.18",
+    "electron": "^15.2.0",
     "electron-builder": "^20.44.4"
   },
   "dependencies": {

.core/.cli/commands/electron/builder/template/package.json.hbs

@@ -49,7 +49,7 @@
   "license": "CC0-1.0",
   "devDependencies": {
     "cross-env": "^5.2.0",
-    "electron": "^2.0.18",
+    "electron": "^15.2.0",
     "electron-builder": "^20.44.4"
   },
   "dependencies": {