chore(dev-deps): bump sinon from 18.0.1 to 21.0.0 (#189)

Bumps [sinon](https://github.com/sinonjs/sinon) from 18.0.1 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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -134,7 +134,7 @@
         "ovsx": "^0.10.4",
         "prettier": "^3.6.0",
         "rimraf": "^6.0.1",
-        "sinon": "^18.0.0",
+        "sinon": "^21.0.0",
         "ts-node": "^10.9.2",
         "typescript": "^5.8.3"
     },