Add python 3.13 to test matrix #1718

Job	Run time
lint (3.8)	10s
test (ubuntu-latest, 3.8)	2m 9s
test (ubuntu-latest, 3.9)	1m 46s
test (ubuntu-latest, 3.10)	1m 45s
test (ubuntu-latest, 3.11)	1m 45s
test (ubuntu-latest, 3.12)	2m 9s
test (ubuntu-latest, 3.13)	3m 34s
test (macos-latest, 3.8)	1m 51s
test (macos-latest, 3.9)	1m 29s
test (macos-latest, 3.10)	1m 33s
test (macos-latest, 3.11)	1m 55s
test (macos-latest, 3.12)	2m 4s
test (macos-latest, 3.13)	3m 19s
test (windows-latest, 3.8)	3m 12s
test (windows-latest, 3.9)	3m 9s
test (windows-latest, 3.10)	2m 53s
test (windows-latest, 3.11)	3m 2s
test (windows-latest, 3.12)	3m 20s
test (windows-latest, 3.13)	3m 21s
test (-r requirements-min.txt, 3.8, ubuntu-latest)	3m 34s
Finish Coveralls	0s
	48m 0s

Provide feedback