[Snyk] Security upgrade pip from 9.0.3 to 19.2#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a655e8e86c283240d96b3b1daef4095d

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Commits on Sep 6, 2020

fix: cluster/juju/charms/trusty/kubernetes-master/requirements.txt to reduce vulnerabilities
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