chore(pyproject): explicitly specify supported Python versions #879

Job	Run time
meta	5s
fossa-scan	5m 48s
compliance-copyrights	25s
pre-commit	14s
test-unit 3.7	2m 2s
test-unit 3.8	1m 33s
test-unit 3.9	1m 31s
test-unit 3.10	1m 32s
test-unit 3.11	1m 29s
test-unit 3.12	1m 38s
test-unit 3.13	1m 58s
semgrep / sast-scan	31s
test-splunk (9.3.1, 0b8d769cb912, true, false)	3m 25s
test-splunk (9.2.3, 282efff6aa8b, false, false)	3m 16s
test-splunk (9.1.6, a28f08fac354, false, true)	3m 27s
publish	1m 12s
	30m 6s

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