chore: bump version to 4.3.1

CI/CD fixes release:
- Lint script now finds SDKs in clients/ directory structure
- Perl lint gracefully skips when modules missing
- Python examples exit 0 when API keys missing (CI-friendly)
- validate-examples.sh race condition fixed

clients/python/async/setup.py

@@ -7,7 +7,7 @@ from setuptools import setup, find_packages
 
 setup(
     name="unsandbox-async",
-    version="4.3.0",
+    version="4.3.1",
     description="Asynchronous Python SDK for unsandbox.com code execution",
     long_description=open("README.md").read() if False else "Async Python SDK for unsandbox code execution",
     author="unsandbox.com",