chore: bump sinon from 20.0.0 to 21.0.0

Bumps [sinon](https://github.com/sinonjs/sinon) from 20.0.0 to 21.0.0.
- [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/commits)

---
updated-dependencies:
- dependency-name: sinon
  dependency-version: 21.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "ava": "^6.4.0",
     "c8": "^10.1.3",
     "eslint": "^9.29.0",
-    "sinon": "^20.0.0",
+    "sinon": "^21.0.0",
     "sinon-chrome": "^3.0.1",
     "stylelint": "^16.20.0",
     "stylelint-config-standard": "^38.0.0",