Bump lodash from 4.17.19 to 4.17.21 in /site (#3541)
Bump lodash from 4.17.19 to 4.17.21 in /site (#3541)

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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