Update pytest requirement from ~=7.1.3 to ~=7.2.0 (#125)

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@7.1.3...7.2.0)

---
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: Rob Brackett <rob@robbrackett.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -9,4 +9,4 @@
 # setup.py.
 coverage ~=6.5
 flake8 ~=5.0.4
-pytest ~=7.1.3
+pytest ~=7.2.0

web_monitoring_diff/tests/test_html_diff.py

@@ -54,7 +54,6 @@ def inner(**kwargs):
         filename = func.__name__ + '-' + '-'.join(kwargs.values()) + '.html'
         with open(OUTPUT_DIR / Path(filename), 'w') as file:
             file.write(d)
-        return d
     return inner
 
 # For now it's unclear what the 'expected' results should be, so these