Add Python 3.13 to CI #847

Job	Run time
Build docs & run doctests	34s
Check types using pyright	37s
Verify dev env (ubuntu-latest)	22s
Tests & Mypy on 3.7	43s
Verify dev env (windows-latest)	1m 4s
Tests & Mypy on 3.8	1m 7s
Tests & Mypy on 3.9	1m 12s
Tests & Mypy on 3.10	1m 30s
Tests & Mypy on 3.11	1m 9s
Tests & Mypy on 3.12	1m 33s
Tests & Mypy on 3.13	1m 54s
Tests & Mypy on pypy-3.8	55s
Tests & Mypy on pypy-3.9	54s
Tests & Mypy on pypy-3.10	56s
Combine & check coverage.	23s
required-checks-pass	4s
	14m 57s

Provide feedback