Update flake8 requirement from ==7.2.* to ==7.3.* (#5268)

Updates the requirements on [flake8](https://github.com/pycqa/flake8) to permit the latest version.
- [Commits](https://github.com/pycqa/flake8/compare/7.2.0...7.3.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-version: 7.3.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -111,7 +111,7 @@ dev = [
   "coverage",
   "coveralls",
   "fakeredis==2.30.*",
-  "flake8==7.2.*",
+  "flake8==7.3.*",
   "freezegun",
   "isort==6.0.*",
   "pep8-naming==0.15.*",