tools: update unified-args to 7.0.0 for md-lint CLI
Update unified-args from 6.0.0 to 7.0.0 for tools/node-lint-md-cli-rollup. This removes a vulnerable package (set-value@0.4.3) from the dependencies.
Refs: https://app.snyk.io/vuln/SNYK-JS-SETVALUE-450213
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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