[Snyk] Security upgrade gatsby from 5.0.0 to 5.4.0#15

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-554988f3e994481ebe8f17aa0caa601f

+2,606-477

Commits on Feb 18, 2023

fix: starters/default/package.json, starters/default/package-lock.json & starters/default/.snyk to reduce vulnerabilities
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