feat: add platform agnostic uname() for user agent

Author: christyjacob4

appwrite/client.py

@@ -1,6 +1,7 @@
 import io
 import json
 import os
+import platform
 import requests
 from .input_file import InputFile
 from .exception import AppwriteException
@@ -13,7 +14,7 @@ def __init__(self):
         self._endpoint = 'https://cloud.appwrite.io/v1'
         self._global_headers = {
             'content-type': '',
-            'user-agent' : f'AppwritePythonSDK/9.0.1 ({os.uname().sysname}; {os.uname().version}; {os.uname().machine})',
+            'user-agent' : f'AppwritePythonSDK/9.0.1 ({platform.uname().system}; {platform.uname().version}; {platform.uname().machine})',
             'x-sdk-name': 'Python',
             'x-sdk-platform': 'server',
             'x-sdk-language': 'python',