[Snyk] Security upgrade webpack-dev-server from 3.11.2 to 4.0.0#1024

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-e3be77f2fd99973b0f98c76eaf397b11

+1-1

Commits on Sep 12, 2021

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