Update pydantic requirement from <3.0,>=2.0 to >=2.13.4,<3.0 in /api

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](pydantic/pydantic@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>

Author: dependabot[bot]

api/pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
   "httpx-oauth==0.16.1",
   "packaging==26.2",
   "psutil==7.0.0",
-  "pydantic>=2.0,<3.0",
+  "pydantic>=2.13.4,<3.0",
   "python-dotenv==1.2.2",
   "python-multipart==0.0.27",
   "sqlalchemy[asyncio]==2.0.40",