packaging: mark as developer version

--HG--
branch : stable
8 jobs for topic/stable/release-prep in 4 minutes and 22 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed checks-py2 #117420

00:02:02

passed checks-py3 #117421

00:02:14

passed doc #117426

00:00:21

manual pytype #117419
allowed to fail manual
passed tests-py2-cext #117422

00:04:08

passed tests-py2-pure #117423

00:03:58

passed tests-py3-cext #117424

00:04:21

passed tests-py3-pure #117425

00:03:54