test

ci: run tests for legacy versions #789

Job	Run time
Lint datadogpy files on Python 3.8	22s
Python 2.7 (legacy) on Linux	1m 43s
Python 3.4 (legacy) on Linux	32s
Python 3.8 on Linux	2m 0s
Python 3.9 on Linux	2m 6s
Python pypy3.8 on Linux	2m 16s
Python 3.7 on Linux	2m 15s
Python 3.10 on Linux	2m 3s
Python 3.14 on Linux	2m 2s
Python 3.11 on Linux	2m 0s
Python 3.12 on Linux	1m 56s
Python 3.13 on Linux	1m 57s
Python pypy2.7 on Linux	2m 11s
	23m 23s

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