Update coverage requirement from >=7.15.0 to >=7.15.3

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@7.15.0...7.15.3)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.15.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test-requirements.txt

@@ -1,4 +1,4 @@
-coverage>=7.15.0
+coverage>=7.15.3
 nose>=1.3.7
 pytest
 pytest-cov