[Snyk] Security upgrade PyYAML from 3.12 to 4.2b1#8

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-48eb7c55c80febf868495ccdf5c9cd8e

+1-1

Commits on May 19, 2021

fix: common/scripts/requirements.txt to reduce vulnerabilities
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