Bump sinon from 1.17.7 to 21.0.1

Bumps [sinon](https://github.com/sinonjs/sinon) from 1.17.7 to 21.0.1.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/main/docs/changelog.md)
- [Commits](https://github.com/sinonjs/sinon/compare/v1.17.7...v21.0.1)

---
updated-dependencies:
- dependency-name: sinon
  dependency-version: 21.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -80,7 +80,7 @@
     "postcss": "^8.5.6",
     "require-from-string": "^2.0.2",
     "sass": "^1.94.2",
-    "sinon": "^1.17.3",
+    "sinon": "^21.0.1",
     "stringify": "^3.2.0",
     "through": "^2.3.8",
     "tosource": "^1.0.0",