chore(deps): update dependency sinon to v21

Author: renovate[bot]

package-lock.json

@@ -68,7 +68,7 @@
 		"lint-staged": "15.5.2",
 		"p-event": "6.0.1",
 		"prettier": "3.6.2",
-		"sinon": "20.0.0",
+		"sinon": "21.0.0",
 		"typescript": "5.9.2",
 		"typescript-eslint": "8.39.0",
 		"vinyl": "3.0.1"