Radosław Piliszek 641b22b2ef CI: Always use upper-constraints
In stable branches we are getting hit by more py2-incompats.
Let's pin u-c in all CI pip invocations.

Change-Id: Ie2bcc7c115cd2aaf4639d90803216011b346daf3
2020-03-30 20:42:08 +02:00
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