Update flake8-pytest-style requirement in /src/bindings/python

Updates the requirements on [flake8-pytest-style](https://github.com/m-burst/flake8-pytest-style) to permit the latest version.
- [Commits](m-burst/flake8-pytest-style@v0.1.0...v2.1.0)

---
updated-dependencies:
- dependency-name: flake8-pytest-style
  dependency-type: direct:production
...

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

src/bindings/python/requirements_test.txt

@@ -14,7 +14,7 @@ flake8-eradicate<=1.5.0
 flake8-executable<=2.1.3
 flake8-expression-complexity<=0.0.11
 flake8-print<=5.0.0
-flake8-pytest-style<=2.0.0
+flake8-pytest-style<=2.1.0
 flake8-rst-docstrings<=0.3.0
 pygments
 flake8-string-format<=0.3.0