chore: bump simple-icons from 13.20.0 to 13.21.0 in /buildTools

Bumps [simple-icons](https://github.com/simple-icons/simple-icons) from 13.20.0 to 13.21.0.
- [Release notes](https://github.com/simple-icons/simple-icons/releases)
- [Commits](simple-icons/simple-icons@13.20.0...13.21.0)

---
updated-dependencies:
- dependency-name: simple-icons
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

buildTools/package.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "change-case": "^5.4.4",
     "n2words": "^1.21.0",
-    "simple-icons": "13.20.0"
+    "simple-icons": "13.21.0"
   }
 }