[Snyk] Security upgrade gatsby from 2.0.19 to 2.1.1#18

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-bf1193f855b0bac1761c62ef4819ff4d

+10,108-3,940

Commits on Dec 1, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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