Bump sinon from 14.0.2 to 15.2.0

Bumps [sinon](https://github.com/sinonjs/sinon) from 14.0.2 to 15.2.0.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/main/docs/changelog.md)
- [Commits](sinonjs/sinon@v14.0.2...v15.2.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -26,7 +26,7 @@
     "eslint-plugin-import": "^2",
     "eslint-plugin-lit": "^1",
     "eslint-plugin-sort-class-members": "^1",
-    "sinon": "^14"
+    "sinon": "^15"
   },
   "files": [
     "d2l-file-uploader.js",