Update pytest requirement from ~=6.2.4 to >=6.2.4,<7.2.0 (#1979)

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.4...7.1.2)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: C. Titus Brown <titus@idyll.org>

setup.cfg

@@ -56,7 +56,7 @@ where = src
 # this syntax may change in the future
 [options.extras_require]
 test =
-    pytest~=6.2.4
+    pytest>=6.2.4,<7.2.0
     pytest-cov~=2.12
     recommonmark
     hypothesis