[Snyk] Security upgrade webpack-dev-server from 3.11.3 to 4.7.3#1014

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-9a653e891969f0aa7e2da9e28a57730b

+1-1

Commits on Jan 12, 2022

fix: packages/gatsby/package.json to reduce vulnerabilities
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