tests

Update Python < 3.8 (3.2 to 3.7) obsolete code and comments #3711

Job	Run time
test_cygwin (39, windows-latest)	15m 54s
collateral (diffcov)	5m 40s
test (3.8, ubuntu-latest)	3m 58s
collateral (docs)	57s
test (3.8, macos-latest)	4m 4s
test (3.8, windows-latest)	3m 54s
test (3.11, ubuntu-latest)	3m 54s
test (3.11, macos-latest)	3m 59s
test (3.11, windows-latest)	3m 50s
test (3.12, ubuntu-latest)	4m 2s
test (3.12, macos-latest)	4m 0s
test (3.12, windows-latest)	3m 54s
test (3.9, ubuntu-latest)	4m 1s
test (3.10, ubuntu-latest)	3m 58s
test (pypy3.10, ubuntu-latest, stdlib)	4m 0s
test (ubuntu-latest, 3.10, stdlib)	3m 43s
integration-test	0s
check	4s
release	0s
	1h 13m 52s

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