chore(deps): update pydantic requirement from >=2.0.0 to >=2.13.4

Updates the requirements on [pydantic](https://github.com/pydantic/pydantic) to permit the latest version.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/v2.13.4/HISTORY.md)
- [Commits](https://github.com/pydantic/pydantic/compare/v2.0...v2.13.4)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.13.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

api/requirements.txt

@@ -2,5 +2,5 @@
 ferro_ta>=1.0.0
 fastapi>=0.110.0
 uvicorn[standard]>=0.27.0
-pydantic>=2.0.0
+pydantic>=2.13.4
 numpy>=1.20