dependency: (deps): bump pydantic-core from 2.18.4 to 2.19.0 in /back…

…end (#147)

Bumps [pydantic-core](https://github.com/pydantic/pydantic-core) from 2.18.4 to 2.19.0.
- [Release notes](https://github.com/pydantic/pydantic-core/releases)
- [Commits](pydantic/pydantic-core@v2.18.4...v2.19.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/requirements.txt

@@ -37,7 +37,7 @@ pillow==10.3.0
 psycopg2==2.9.9
 pycparser==2.22
 pydantic==2.7.4
-pydantic_core==2.18.4
+pydantic_core==2.19.0
 PyJWT==2.8.0
 pymongo==4.7.3
 PyMuPDF==1.24.5