Add python 3.13 to test matrix (#215) #1754

Job	Run time
lint (3.8)	7s
test (ubuntu-latest, 3.8)	2m 10s
test (ubuntu-latest, 3.9)	1m 45s
test (ubuntu-latest, 3.10)	1m 46s
test (ubuntu-latest, 3.11)	1m 46s
test (ubuntu-latest, 3.12)	2m 11s
test (ubuntu-latest, 3.13)	3m 0s
test (macos-latest, 3.8)	2m 0s
test (macos-latest, 3.9)	2m 2s
test (macos-latest, 3.10)	1m 37s
test (macos-latest, 3.11)	1m 24s
test (macos-latest, 3.12)	1m 24s
test (macos-latest, 3.13)	1m 30s
test (windows-latest, 3.8)	3m 6s
test (windows-latest, 3.9)	2m 42s
test (windows-latest, 3.10)	3m 23s
test (windows-latest, 3.11)	3m 29s
test (windows-latest, 3.12)	3m 33s
test (windows-latest, 3.13)	4m 36s
test (-r requirements-min.txt, 3.8, ubuntu-latest)	4m 21s
Finish Coveralls	11s
	48m 3s

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