Add Python 3.13 to CI (#1256) #848

Job	Run time
Check types using pyright	30s
Build docs & run doctests	33s
Verify dev env (ubuntu-latest)	24s
Tests & Mypy on 3.7	43s
Tests & Mypy on 3.8	1m 2s
Tests & Mypy on 3.9	1m 6s
Tests & Mypy on 3.10	1m 18s
Tests & Mypy on 3.11	1m 6s
Tests & Mypy on 3.12	1m 24s
Tests & Mypy on 3.13	2m 27s
Tests & Mypy on pypy-3.8	56s
Tests & Mypy on pypy-3.9	58s
Tests & Mypy on pypy-3.10	53s
Verify dev env (windows-latest)	58s
Combine & check coverage.	10s
required-checks-pass	2s
	14m 30s

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