[Snyk] Security upgrade gatsby from 4.0.0 to 4.6.0#15

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snyk-bot wants to merge 20 commits intomasterfrom snyk-fix-4a71037e5ee0ad71cbd1c43ba82496ee

+40,071-44,213

Commits on Nov 3, 2020

Update README.md
0xSebin
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Commits on Feb 19, 2022

Commits on Feb 20, 2022