Bump commander from 5.1.0 to 7.1.0

Bumps [commander](https://github.com/tj/commander.js) from 5.1.0 to 7.1.0.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](tj/commander.js@v5.1.0...v7.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -29,7 +29,7 @@
   "homepage": "https://github.com/XhmikosR/find-unused-sass-variables#readme",
   "dependencies": {
     "chalk": "^4.1.0",
-    "commander": "^5.1.0",
+    "commander": "^7.1.0",
     "escape-string-regexp": "^4.0.0",
     "glob": "^7.1.6",
     "postcss": "^8.2.6",