Python dependency: Update pycodestyle requirement in /web/regression (#10492)

Updates the requirements on [pycodestyle](https://github.com/PyCQA/pycodestyle) to permit the latest version.
- [Release notes](https://github.com/PyCQA/pycodestyle/releases)
- [Changelog](https://github.com/PyCQA/pycodestyle/blob/main/CHANGES.txt)
- [Commits](https://github.com/PyCQA/pycodestyle/compare/2.14.0...2.15.0)

---
updated-dependencies:
- dependency-name: pycodestyle
  dependency-version: 2.15.0
  dependency-type: direct:production
...

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web/regression/requirements.txt

@@ -25,7 +25,7 @@ extras==1.0.0
 fixtures==4.3.2
 linecache2==1.0.0
 pbr==7.0.3
-pycodestyle>=2.14.0
+pycodestyle>=2.15.0
 python-mimeparse==2.0.0
 selenium==4.44.0; python_version <= '3.9'
 selenium==4.49.0; python_version > '3.9'