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

PR-URL: https://github.com/nodejs/node/pull/28434
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

tools/node-lint-md-cli-rollup/package.json

@@ -10,7 +10,7 @@
     "remark": "^10.0.1",
     "remark-lint": "^6.0.4",
     "remark-preset-lint-node": "^1.7.0",
-    "unified-args": "^6.0.0",
+    "unified-args": "^7.0.0",
     "unified-engine": "^6.0.1"
   },
   "main": "src/cli-entry.js",