chore(deps): update coverage requirement from ~=7.5.4 to ~=7.6.0 in /api

Updates the requirements on [coverage](https://github.com/nedbat/coveragepy) to permit the latest version.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.5.4...7.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

api/requirements.txt

@@ -1,6 +1,6 @@
 captcha~=0.5.0
 celery~=5.4.0
-coverage~=7.5.4
+coverage~=7.6.0
 cryptography~=42.0.8
 Django~=5.0.6
 django-cors-headers~=4.4.0