pip prod(deps): update coverage requirement from ~=6.3 to ~=7.3

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@6.3...7.3.0)

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

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

requirements_test.txt

@@ -1,5 +1,5 @@
 pytest~=6.2.5
-coverage~=6.3
+coverage~=7.3
 pytest-cov~=3.0.0
 coveralls~=3.3.1
 numpy~=1.22.4