[Snyk] Security upgrade pyyaml from 3.11 to 5.4#3

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one3chens wants to merge 1 commit intomasterfrom snyk-fix-d98be95a663ea67ae0aa4b01b8b44d80

+1-1

Commits on Jan 21, 2021

fix: requirements.txt to reduce vulnerabilities
snyk-bot
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