Fix: specify dmg target in mac config

When the target array was removed to enable CLI arch control,
we need to still specify the target type (dmg). Without this,
electron-builder doesn't know what artifact to produce.

Author: ammar-agent

package.json

@@ -120,6 +120,7 @@
     ],
     "mac": {
       "category": "public.app-category.developer-tools",
+      "target": "dmg",
       "icon": "build/icon.icns",
       "artifactName": "${productName}-${version}-${arch}.${ext}",
       "hardenedRuntime": true,