test

ci: run tests for legacy versions #799

Job	Run time
Python 3.4 (legacy) on Linux	2m 33s
Lint datadogpy files on Python 3.8	22s
Python 3.7 on Linux	2m 5s
Python 3.10 on Linux	2m 2s
Python 3.8 on Linux	1m 33s
Python 3.14 on Linux	2m 16s
Python pypy3.8 on Linux	2m 38s
Python pypy2.7 on Linux	2m 24s
Python 3.11 on Linux	1m 59s
Python 2.7 (legacy) on Linux	2m 5s
Python 3.9 on Linux	2m 13s
Python 3.13 on Linux	2m 41s
Python 3.12 on Linux	2m 21s
	27m 12s

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