Bump actions/download-artifact from 3 to 4 #1666

Job	Run time
Check linting	34s
Python 3.8/Cython: true	3m 5s
Python 3.8/Cython: false	3m 6s
Python 3.9/Cython: true	2m 49s
Python 3.9/Cython: false	2m 55s
Python 3.10/Cython: true	3m 1s
Python 3.10/Cython: false	2m 58s
Python 3.11/Cython: true	2m 53s
Python 3.11/Cython: false	2m 44s
Python 3.12/Cython: true	4m 17s
Python 3.12/Cython: false	3m 36s
Python pypy3.9/Cython: false	7m 2s
Python ~3.13.0-0/Cython: false	5m 32s
✅ Ensure the required checks passing	4s
📦 Build the source distribution	0s
📦 Build wheels on ${{ matrix.os }}	0s
📦 Publish to PyPI	0s
	44m 36s

Provide feedback