MNT/CI: add Python 3.13 to test matrix #1084

Job	Run time
Linting (Ruff)	57s
Test readme renders on PyPi	14s
Test import order (isort)	49s
Tests on 3.9 (Minimum Versions)	13m 10s
Tests on 3.9	12m 46s
Tests on 3.10	10m 34s
Tests on 3.11	10m 46s
Tests on 3.12	12m 21s
Tests on 3.13	17m 14s
Test Docs / Build Documentation	5m 2s
Test Docs / Deploy Documentation	0s
	1h 23m 53s

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