[CI] Update Github action versions, cache pip #702

	name: Lint-flake8

	on:
	push:
	branches:
	- '*'
	pull_request:
	branches:
	- '*'

	jobs:
	flake8:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python 3.8
	uses: actions/setup-python@v5
	with:
	python-version: 3.8
	cache: pip
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	make install-lint
	- name: Run flake8
	run: \|
	make flake8

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