Bump actions/setup-python from 4 to 5 (#61) #106

Job	Run time
Build docs & run doctests	24s
Verify dev env (ubuntu-latest)	21s
Run linters	30s
Verify dev env (windows-latest)	1m 4s
Type-check package	16s
Verify dev env (macos-latest)	25s
Tests on 3.8	1m 3s
Tests on 3.9	1m 9s
Tests on 3.10	59s
Tests on 3.11	58s
Tests on 3.12	1m 8s
Tests on pypy-3.8	1m 11s
Tests on pypy-3.9	1m 8s
Combine & check coverage.	8s
required-checks-pass	2s
	10m 46s

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