chore(deps): update coverage[toml] requirement from ~=7.5 to ~=7.6 (#404

)

Updates the requirements on [coverage[toml]](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@7.5.0...7.6.0)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-type: direct:production
...

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

requirements-testing.txt

@@ -1,4 +1,4 @@
-coverage[toml] ~= 7.5; python_version == '3.7'
+coverage[toml] ~= 7.6; python_version == '3.7'
 coverage[toml] == 7.*; python_version > '3.7'
 coverage-conditional-plugin == 0.9.*
 pytest == 7.*