bump version from `0.21.0rc3` to `0.21.0rc4` #57

	name: Supervision Test Releases to PyPi
	on:
	push:
	tags:
	- '[0-9]+.[0-9]+[0-9]+.[0-9]+a[0-9]'
	- '[0-9]+.[0-9]+[0-9]+.[0-9]+b[0-9]'
	- '[0-9]+.[0-9]+[0-9]+.[0-9]+rc[0-9]'

	workflow_dispatch:

	jobs:
	build-n-publish:
	name: Build and publish to PyPI
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.10"]
	steps:
	- name: 🛎️ Checkout
	uses: actions/checkout@v4
	with:
	ref: ${{ github.head_ref }}
	- name: 🐍 Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}

	- name: 🏗️ Build source and wheel distributions
	run: \|
	python -m pip install --upgrade build twine
	python -m build
	twine check --strict dist/*
	- name: 🚀 Publish distribution to PyPI
	uses: pypa/gh-action-pypi-publish@release/v1
	with:
	user: ${{ secrets.PYPI_USERNAME }}
	password: ${{ secrets.PYPI_PASSWORD }}
	- name: 🚀 Publish to Test-PyPi
	uses: pypa/gh-action-pypi-publish@release/v1
	with:
	repository-url: https://test.pypi.org/legacy/
	user: ${{ secrets.PYPI_TEST_USERNAME }}
	password: ${{ secrets.PYPI_TEST_PASSWORD }}

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