Bump coverage from 6.5 to 7.0.1

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.5 to 7.0.1.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.5.0...7.0.1)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pyproject.toml

@@ -30,7 +30,7 @@ Home = "https://github.com/pyvista/pytest-pyvista"
 [project.optional-dependencies]
 tests = [
     "codecov<2.2.0",
-    "coverage==6.5",
+    "coverage==7.0.1",
     "pytest>=3.5.0",
     "pytest-cov==4.0.0",
     "pyvista>=0.37",