chore: bump sinon from 18.0.1 to 21.0.0 (#17)

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
...

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

Author: dependabot[bot]

package.json

@@ -169,7 +169,7 @@
     "@types/dns-packet": "^5.6.5",
     "@types/sinon": "^17.0.2",
     "aegir": "^47.0.21",
-    "sinon": "^18.0.0"
+    "sinon": "^21.0.0"
   },
   "browser": {
     "./dist/src/resolvers/default.js": "./dist/src/resolvers/default.browser.js"