chore(deps): update coverage requirement in /api

Updates the requirements on [coverage](https://github.com/coveragepy/coveragepy) to permit the latest version.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.13.2...7.13.4)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.13.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

api/requirements.txt

@@ -1,6 +1,6 @@
 captcha~=0.7.1
 celery~=5.6.2
-coverage~=7.13.2
+coverage~=7.13.4
 cryptography~=46.0.4
 Django~=5.2.7
 django-cors-headers~=4.9.0