Add plist file for Mac permissions (#5756)

# Description of Changes
There's speculation that the Mac app failing to connect to self-hosted
servers (#5264) is because of missing OS-permissions
[NSLocalNetworkUsageDescription](https://developer.apple.com/documentation/bundleresources/information-property-list/nslocalnetworkusagedescription).
This PR adds it in a `Info.plist` file which ships with the Tauri app
which should throw an OS permissions dialog if required.

frontend/src-tauri/tauri.conf.json

@@ -76,7 +76,8 @@
             "minimumSystemVersion": "10.15",
             "signingIdentity": null,
             "entitlements": null,
-            "providerShortName": null
+            "providerShortName": null,
+            "infoPlist": "Info.plist"
         }
     },
     "plugins": {