Bump pygments from 2.18.0 to 2.19.2 (#2804)

Bumps [pygments](https://github.com/pygments/pygments) from 2.18.0 to 2.19.2.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.18.0...2.19.2)

---
updated-dependencies:
- dependency-name: pygments
  dependency-version: 2.19.2
  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>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -341,7 +341,7 @@ pydantic==2.12.3
     # via openai
 pydantic-core==2.41.4
     # via pydantic
-pygments==2.18.0
+pygments==2.19.2
     # via rich
 pyjwt==2.10.1
     # via