Update pytest-cov requirement from <6 to <8

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v1.0...v7.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 7.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -87,7 +87,7 @@ dev = [
     "pytest<9",
     "pytest-flask<2",
     "filetype<2",
-    "pytest-cov<6",
+    "pytest-cov<8",
     "covdefaults<3",
 ]