Include installed version in upgrade warning (#188)

New message:

```
Warning: Looks like you're using an outdated `kagglehub` version (installed: 0.3.3), please consider upgrading to the latest version (0.3.4).
```

Thread: https://chat.kaggle.net/kaggle/pl/6igpgm5a57nr9pwuyo63ugxxqh

Author: rosbo

src/kagglehub/clients.py

@@ -101,8 +101,8 @@ def _check_for_version_update(self, response: requests.Response) -> None:
             latest_version = parse(latest_version_str)
             if latest_version > current_version:
                 logger.info(
-                    "Warning: Looks like you're using an outdated `kagglehub` "
-                    f"version, please consider updating (latest version: {latest_version})"
+                    f"Warning: Looks like you're using an outdated `kagglehub` version (installed: {current_version}), "
+                    f"please consider upgrading to the latest version ({latest_version})."
                 )
 
     def get(self, path: str, resource_handle: Optional[ResourceHandle] = None) -> dict: