We don't currently use flake8

pytest-flake8 is causing CI to fail with Python 3.12 with

pluggy._manager.PluginValidationError: Plugin 'flake8' for hook 'pytest_collect_file'
hookimpl definition: pytest_collect_file(file_path, path, parent)
Argument(s) {'path'} are declared in the hookimpl but can not be found in the hookspec

Since we don't use flake8, just remove this.

Author: benmwebb

support/setup_ci.sh

@@ -32,10 +32,4 @@ conda create --yes -q -n python${python_version} -c salilab python=${python_vers
 eval "$(conda shell.bash hook)"
 conda activate python${python_version}
 
-if [ ${python_version} = "2.7" ]; then
-  # pytest-flake8 1.1.0 tries to import contextlib.redirect_stdout, which
-  # isn't present in Python 2
-  pip install pytest-cov coverage 'pytest-flake8<1.1'
-else
-  pip install pytest-cov coverage pytest-flake8
-fi
+pip install pytest-cov coverage