Revert "Don't depend on flake8 at runtime (#6830)"

.github/workflows/ci.yml

@@ -241,9 +241,4 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-      - uses: actions/setup-python@v4
-        with:
-          python-version-file: .python-version
-          cache: pip
-      - run: pip install -r requirements.txt
       - run: ./bin/lint

bin/lint

@@ -15,5 +15,3 @@ shellcheck \
   "$@"
 
 bundle exec rubocop
-
-flake8 python/helpers/. --count --exclude=./.*,./python/spec/fixtures --show-source --statistics

python/helpers/requirements.txt

@@ -1,5 +1,6 @@
 pip==23.2.0
 pip-tools==7.2.0
+flake8==5.0.4
 hashin==0.17.0
 pipenv==2022.4.8
 pipfile==0.0.2

python/script/ci-test

@@ -2,5 +2,7 @@
 
 set -e
 
+pyenv exec flake8 helpers/. --count --exclude=./.*,./python/spec/fixtures --show-source --statistics
+
 bundle install
 bundle exec parallel_test spec/ -n "$CI_NODE_TOTAL" --only-group "$CI_NODE_INDEX" --group-by filesize --type rspec --verbose