build(deps): update pytest requirement from <7,>=6.2.5 to >=6.2.5,<9 (#19)

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@6.2.5...8.0.0)

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

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

Author: dependabot[bot]

requirements/testing.txt

@@ -1,5 +1,5 @@
 # pip install -r requirements/testing.txt
-pytest>=6.2.5,<7
+pytest>=6.2.5,<9
 pytest-cov>=3,<5
 Flask>=2.0.3,<4 
 gevent>=22.10.2,<24