Update pytest-cov requirement from <7 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:development
...

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

Author: dependabot[bot]

setup.py

@@ -62,7 +62,7 @@
     extras_require={
         "testing": [
             "pytest<9",
-            "pytest-cov<7",
+            "pytest-cov<8",
             "pytest-freezer<0.5",
             "pytest-mock<4",
             "pytest-random-order<2",