Update coverage[toml] requirement from ~=7.5.4 to ~=7.6.0

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@7.5.4...7.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -107,7 +107,7 @@ sphinx = [
 ]
 pytest = ["pytest >= 8"]
 test = [
-    "coverage [toml] ~= 7.5.4",
+    "coverage [toml] ~= 7.6.0",
     "pytest ~= 8.2.2",
     # More pytest plugins at: https://docs.pytest.org/en/latest/reference/plugin_list.html
     "pytest-cases ~= 3.8.3",