chore: bump version to 1.5.3

Patch release for the clone pagination fix (#24, UN-3770 step 1):
list_* helpers now follow DRF pagination instead of silently
truncating to page one.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018HXYFVCZGi7YN9qjDGyJCQ

Author: chandrasekharan-zipstack

src/unstract/api_deployments/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "1.5.2"
+__version__ = "1.5.3"
 
 from .client import APIDeploymentsClient as APIDeploymentsClient