[Snyk] Security upgrade pygments from 2.5.2 to 2.7.4#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-1baadd5e8c05484cc61c59de401e82f9

+2-1

Commits on Sep 7, 2021

fix: requirements-dev.txt to reduce vulnerabilities
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