test

ci: run tests for legacy versions #801

Job	Run time
Python 3.7 on Linux	2m 11s
Python 3.9 on Linux	2m 9s
Python 3.8 on Linux	2m 0s
Python 3.4 (legacy) on Linux	2m 18s
Python pypy2.7 on Linux	2m 19s
Python pypy3.8 on Linux	49s
Python 3.11 on Linux	1m 57s
Python 3.12 on Linux	1m 58s
Python 2.7 (legacy) on Linux	33s
Lint datadogpy files on Python 3.8	20s
Python 3.10 on Linux	2m 2s
Python 3.13 on Linux	2m 0s
Python 3.14 on Linux	2m 4s
	22m 40s

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