[Snyk] Security upgrade gatsby-source-contentful from 2.3.56 to 4.5.0#39

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-fa90734a89af646a487a8976b495525a

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Commits on Jan 20, 2021

fix: examples/using-contentful/package.json to reduce vulnerabilities
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