Bump coverage from 7.13.3 to 7.14.3 in /mailbox-app

Bumps [coverage](https://github.com/coveragepy/coveragepy) from 7.13.3 to 7.14.3.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.13.3...7.14.3)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.14.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

mailbox-app/requirements/constraints.txt

@@ -5,7 +5,7 @@ asgiref==3.11.1
 bandit==1.9.4
 bleach==6.4.0
 cffi==2.0.0
-coverage==7.13.3
+coverage==7.14.3
 Django==5.2.15
 filelock==3.20.3
 gunicorn==25.1.0

mailbox-app/requirements/development.txt

@@ -1,6 +1,6 @@
 -r locked.txt
 bandit==1.9.4
-coverage==7.13.3
+coverage==7.14.3
 pip-audit==2.10.0
 pytest==9.1.1
 pytest-cov==7.0.0