[Snyk] Security upgrade gatsby-source-filesystem from 2.11.1 to 4.21.0#1406

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-f4093b265384acb5804ea847c9cae151

Commits on Aug 16, 2022

fix: packages/gatsby-source-drupal/package.json to reduce vulnerabilities
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