Bump actions/download-artifact from 6 to 7 in the actions group #221

Job	Run time
Tests for Python 3.10 on macOS-latest	49s
Tests for Python 3.13 on ubuntu-latest	1m 29s
Tests for Python 3.11 on ubuntu-latest	1m 31s
Tests for Python 3.14 on ubuntu-latest	57s
Tests for Python 3.10 on windows-latest	1m 36s
Tests for Python 3.12 on ubuntu-latest	1m 28s
Tests for Python 3.10 on ubuntu-latest	1m 32s
	9m 22s

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