MAINT: Bump pytest from 6.2.5 to 7.0.1 (#160)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.5 to 7.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.5...7.0.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

setup.py

@@ -24,7 +24,7 @@
         "lxml == 4.6.5",
     ],
     "linting": ["flake8 == 4.0.1", "black == 21.12b0"],
-    "testing": ["pytest == 6.2.5", "coverage[toml] == 6.3.2"],
+    "testing": ["pytest == 7.0.1", "coverage[toml] == 6.3.2"],
     "dev": [
         "lxml-stubs == 0.3.1",
         "python-semantic-release == 7.25.2",