[Snyk] Security upgrade pyyaml from 3.13 to 4.2b1#6

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d689f56c9eca0fb3b7830f2a47dd4699

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Commits on Dec 24, 2020

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