[Snyk] Security upgrade lxml from 3.2.1 to 4.6.3#3

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snyk-fix-07cf058cdee3107049791290fd331988

Commits on Mar 23, 2021

fix: chrome/common/extensions/docs/server2/test_data/github_file_system/test_owner/repo/unzipped_repo/requirements.txt to reduce vulnerabilities
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