Fix the BUG in the __init__ file of openhands to obtain the version (#9840)

Co-authored-by: yinjiaqi <yinjiaqi@baidu.com>

openhands/__init__.py

@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 
 __package_name__ = 'openhands_ai'
 
@@ -7,10 +8,16 @@ def get_version():
     # Try getting the version from pyproject.toml
     try:
         root_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        with open(os.path.join(root_dir, 'pyproject.toml'), 'r') as f:
-            for line in f:
-                if line.startswith('version ='):
-                    return line.split('=')[1].strip().strip('"')
+        candidate_paths = [
+            Path(root_dir) / 'pyproject.toml',
+            Path(root_dir) / 'openhands' / 'pyproject.toml',
+        ]
+        for file_path in candidate_paths:
+            if file_path.is_file():
+                with open(file_path, 'r') as f:
+                    for line in f:
+                        if line.strip().startswith('version ='):
+                            return line.split('=', 1)[1].strip().strip('"').strip("'")
     except FileNotFoundError:
         pass