Bump coverage from 6.2 to 7.8.0 (#74)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.2 to 7.8.0.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@6.2...7.8.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.8.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

setup.cfg

@@ -47,7 +47,7 @@ install_requires =
 
 [options.extras_require]
 testing =
-  coverage == 6.2
+  coverage == 7.8.0
   mypy == 1.15.0
 
 [options.entry_points]