feat: update jsonschema constraint to >=4.20,<5.0 for fastmcp compatibility

- Update jsonschema version constraint from ~4.17.3 to >=4.20,<5.0
- Regenerate poetry.lock with new constraint
- No code changes - testing if version bump alone resolves CI issues

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

Author: devin-ai-integration[bot]