set cocoapods darwin only

Author: abueide

devbox.json

@@ -5,10 +5,13 @@
     "nodejs":        "latest",
     "act":           "latest",
     "git":           "latest",
-    "cocoapods":     "latest",
     "gradle":        "latest",
     "jdk17":         "latest",
-    "android-tools": "latest"
+    "android-tools": "latest",
+    "cocoapods": {
+      "version":   "latest",
+      "platforms": ["aarch64-darwin", "x86_64-darwin"]
+    }
   },
   "shell": {
     "init_hook": [