🤖 fix: add mac zip artifact for auto updates (#515)

## Summary
- add zip to the mac electron-builder targets so auto-updater has the
required archive

## Testing
- not run (config-only change)

_Generated with `cmux`_

Author: ibetitsmike

package.json

@@ -183,7 +183,10 @@
     ],
     "mac": {
       "category": "public.app-category.developer-tools",
-      "target": "dmg",
+      "target": [
+        "dmg",
+        "zip"
+      ],
       "icon": "build/icon.icns",
       "artifactName": "${productName}-${version}-${arch}.${ext}",
       "hardenedRuntime": true,