Update dependency flake8 to v7 #1954

	# Copyright 2021 Google LLC
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Run unit tests
	on:
	pull_request:
	paths-ignore:
	- 'CHANGELOG.md'
	- 'README.md'
	- 'version.txt'
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8.12]
	steps:
	- uses: actions/checkout@v2
	- uses: hashicorp/setup-terraform@v2
	with:
	terraform_version: 0.15.1
	- name: Setup Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install poetry
	run: curl -sSL https://install.python-poetry.org \| python3 - --preview
	- name: Install dependencies
	run: poetry install --only pipelines
	- name: Initialize Airflow
	run: poetry run airflow db init
	- name: Run tests
	run: poetry run python -m pytest -v tests

Provide feedback