[Snyk] Security upgrade gatsby-plugin-manifest from 3.6.0 to 4.8.0#6

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nwehner wants to merge 1 commit intomainfrom

snyk-fix-f160513ede99d273e13d79d44a8acc59

Commits on May 26, 2022

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