Bump gunicorn from 25.0.1 to 25.0.3 in /src (#4411)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 25.0.1 to 25.0.3.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@25.0.1...25.0.3)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 25.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/requirements.txt

@@ -1,6 +1,6 @@
 flask==3.1.2
 flask-talisman==1.1.0
-gunicorn==25.0.1
+gunicorn==25.0.3
 pytest==9.0.2
 pytest-watch==4.2.0
 pytest-cov==7.0.0