build(deps-dev): bump sinon from 15.1.2 to 21.0.0

Bumps [sinon](https://github.com/sinonjs/sinon) from 15.1.2 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] <[email protected]>

Author: dependabot[bot]

package.json

@@ -66,7 +66,7 @@
     "rollup-plugin-sass": "^1.15.3",
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-visualizer": "^5.14.0",
-    "sinon": "^15.2.0",
+    "sinon": "^21.0.0",
     "start-server-and-test": "^2.1.3"
   },
   "publishConfig": {