feat: Update destination-pgvector to use CDK with langchain 1.0

- Update CDK dependency to use local path (langchain upgrade branch)
- Temporarily comment out PyAirbyte dependency (will restore after CDK PR merges)
- Update Python version constraint to ^3.10,<3.13
- Run poetry lock to update dependencies

This is Stage 3 of the langchain upgrade plan:
- Stage 1: ✅ Bump pgvector to latest CDK (skipped, handled by PyAirbyte)
- Stage 2: ✅ Bump langchain in CDK (PR #810)
- Stage 3: 🔄 Update pgvector to use new CDK with updated langchain

Related PR: airbytehq/airbyte-python-cdk#810

Co-Authored-By: AJ Steers <[email protected]>

Author: devin-ai-integration[bot]