Bump flake8 from 7.0.0 to 7.1.0 in /third_party/airflow

Bumps [flake8](https://github.com/pycqa/flake8) from 7.0.0 to 7.1.0.
- [Commits](PyCQA/flake8@7.0.0...7.1.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

third_party/airflow/pyproject.toml

@@ -25,7 +25,7 @@ classifiers=[
 ]
 
 [project.optional-dependencies]
-format = ["black>=24.0.0", "flake8==7.0.0", "pylint==2.17.5"]
+format = ["black>=24.0.0", "flake8==7.1.0", "pylint==2.17.5"]
 test = ["pytest==7.3.1", "coverage==7.3.2", "pytest-asyncio==0.21.1",
   "pytest-mock>=3.14.0"]
 # note(JayF): sphinx-jekyll-builder was broken by sphinx-markdown-builder 0.6 -- so pin to 0.5.5