[Snyk] Security upgrade jekyll from 3.6.2 to 3.6.2#7

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-cbeefe9dbf688c90d651619269dcc068

+37-25

Commits on Jul 13, 2021

fix: Gemfile & Gemfile.lock to reduce vulnerabilities
snyk-bot
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