test

ci: run tests for legacy versions #794

Job	Run time
Python 2.7 (legacy) on Linux	1m 47s
Lint datadogpy files on Python 3.8	14s
Python pypy2.7 on Linux	2m 29s
Python 3.8 on Linux	14s
Python 3.11 on Linux	8s
Python 3.10 on Linux	10s
Python 3.7 on Linux	15s
Python 3.4 (legacy) on Linux	2m 10s
Python 3.13 on Linux	10s
Python 3.12 on Linux	9s
Python pypy3.8 on Linux	16s
Python 3.14 on Linux	9s
Python 3.9 on Linux	14s
	8m 25s

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