[Snyk] Security upgrade unified-args from 8.1.0 to 9.0.0#7

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-81564fbde05b7dc50f1a995e6e49e906

+664-352

Commits on Sep 13, 2021

fix: tools/node-lint-md-cli-rollup/package.json & tools/node-lint-md-cli-rollup/package-lock.json to reduce vulnerabilities
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