Unpin/fix Pyright (#1302) #991

Job	Run time
Run CodSpeed benchmarks	2m 3s
Verify dev env (ubuntu-latest)	20s
Verify dev env (windows-latest)	45s
Build docs & run doctests	18s
Check types using pyright	20s
Tests & Mypy on 3.7	42s
Tests & Mypy on 3.8	47s
Tests & Mypy on 3.9	46s
Tests & Mypy on 3.10	59s
Tests & Mypy on 3.11	53s
Tests & Mypy on 3.12	1m 8s
Tests & Mypy on 3.13	45s
Tests & Mypy on pypy-3.8	55s
Tests & Mypy on pypy-3.9	48s
Tests & Mypy on pypy-3.10	48s
Combine & check coverage.	8s
required-checks-pass	2s
	12m 27s

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