build(deps): bump coverage[toml] in the dependencies group

Bumps the dependencies group with 1 update: [coverage[toml]](https://github.com/nedbat/coveragepy).


Updates `coverage[toml]` from 7.7.1 to 7.8.0
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.7.1...7.8.0)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-version: 7.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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

Author: dependabot[bot]

requirements/test.txt

@@ -4,5 +4,5 @@
 -r pinned.txt
 
 # coverage measurement
-coverage[toml]==7.7.1
+coverage[toml]==7.8.0
 freezegun==1.5.1