Bump minimist from 1.2.5 to 1.2.6 (#21561)

Bumps [minimist](https://github.com/substack/minimist) from 1.2.5 to 1.2.6.
- [Release notes](https://github.com/substack/minimist/releases)
- [Commits](https://github.com/substack/minimist/compare/1.2.5...1.2.6)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: direct:development
...

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package.json

@@ -130,7 +130,7 @@
     "matrix-react-test-utils": "^0.2.3",
     "matrix-web-i18n": "^1.2.0",
     "mini-css-extract-plugin": "^0.12.0",
-    "minimist": "^1.2.5",
+    "minimist": "^1.2.6",
     "mkdirp": "^1.0.4",
     "modernizr": "^3.12.0",
     "node-fetch": "^2.6.7",