fix(desktop): lower macOS minimum version to 13.0 (Ventura) (#699)

The desktop app builds and runs correctly on macOS Ventura (13.x).
Lowering minimumSystemVersion from 14.0 to 13.0 allows users on
Ventura to build and use the desktop app.

Co-authored-by: Craig Harman <craigharman@transdigital.com.au>

packages/desktop/src-tauri/tauri.conf.json

@@ -52,7 +52,7 @@
     ],
     "macOS": {
       "exceptionDomain": "localhost",
-      "minimumSystemVersion": "14.0",
+      "minimumSystemVersion": "13.0",
       "signingIdentity": null,
       "entitlements": "./entitlements.plist",
       "infoPlist": "Info.plist",