chore(tox): drop py27 testing

4 jobs for !24 with topic/default/set_cubes_cw_max_version in 1 minute and 22 seconds (queued for 5 seconds)
merge request
Name Stage Failure
failed
py27 Tests
2021-12-07 08:58:37.585 UTC [152] STATEMENT:  CREATE LANGUAGE plpythonu
----------------------------- Captured stderr call -----------------------------
building tmpdb failed
================ 1 failed, 2 passed, 1 skipped in 22.67 seconds ================
ERROR: InvocationError for command '/builds/cubicweb/cubes/postgis/.tox/py27/bin/python -m pytest' (exited with code 1)
___________________________________ summary ____________________________________
ERROR: py27: commands failed
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1