Bump pip from 21.1 to 23.3 #192

	name: Minimal Testing

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Check out
	uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Set up Python 3.7
	uses: actions/setup-python@v1
	with:
	python-version: 3.7

	- name: Dependency (ubuntu)
	run: \|
	# for GUI widget testing
	sudo apt-get install xvfb -y

	- name: Dependency (pip)
	run: \|
	# testing tools & visualization packages
	python -m pip install invoke pytest pandas matplotlib bokeh
	pip install -r requirements.txt
	- name: Customized calmap
	run: \|
	# it matters to use this repo to adapt the customized bug fix
	git clone https://github.com/zztin/calmap
	cd calmap
	python setup.py install
	- name: Packaging
	run: \|
	python ${GITHUB_WORKSPACE}/setup.py install
	which ctimer

	- name: PyTest Cases
	run: \|
	# used for tkinter widget test cases
	# otherwise tkinter will complain when running on github action
	# "_tkinter.TclError: no display name and no $DISPLAY environment variable"
	Xvfb :99 &
	export DISPLAY=:99

	inv test

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