1587: Pin test/build pip-dependencies to their last known versions r=mergify[bot] a=Nebukadneza

## What type of PR?

bug-fix

## What does this PR do?
Fix current travis docker API-version mismatches … in a crude, but safe
way.

### Related issue(s)
None

## Prerequistes
- [x] no docs
- [x] minor change


Co-authored-by: Dario Ernst <dario@kanojo.de>
master
bors[bot] 4 years ago committed by GitHub
commit 14f5fd8278
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@ -1,2 +1,2 @@
docker
colorama
docker==4.2.2
colorama==0.4.3

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