fix(script): fix script with new CSharpSDK folder

Author: MingboPeng

.openapi-generator/update_assembly_version.py

@@ -44,7 +44,7 @@
 print(f'New version: {new_version}')
 
 # update the version
-assembly_file = os.path.join(os.getcwd(), 'src', package_name, f'{package_name}.csproj')
+assembly_file = os.path.join(os.getcwd(), 'src', 'CSharpSDK', f'{package_name}.csproj')
 
 with open(assembly_file, encoding='utf-8', mode='r') as csFile:
     s = csFile.read()