chore(deps): bump pydantic from 2.11.1 to 2.13.3 in /backend

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.11.1 to 2.13.3.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](https://github.com/pydantic/pydantic/compare/v2.11.1...v2.13.3)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.13.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/pyproject.toml

@@ -20,7 +20,7 @@ dependencies = [
     "httpx==0.28.1",
     "playwright==1.50.0",
     "playwright-stealth==1.0.6",
-    "pydantic==2.11.1",
+    "pydantic==2.13.3",
     "pydantic-settings==2.8.1",
     "pystac-client==0.8.6",
     "python-dotenv==1.2.2",