chore: bump version to 0.11.3 for PyPI publication

PyPI rejects reused version numbers. Updated from 0.11.2 to 0.11.3.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: esteininger

setup.py

@@ -6,7 +6,7 @@
 
 setup(
     name='mixpeek',
-    version='0.11.2',
+    version="0.11.3",
     author='Ethan Steininger',
     author_email='ethan@mixpeek.com',
     description='Mixpeek Python SDK',