chore(deps): update dependency sinon to v21

Author: renovate[bot]

package-lock.json

@@ -51,7 +51,7 @@
     "prettier": "3.5.3",
     "publint": "0.3.12",
     "semantic-release": "24.2.5",
-    "sinon": "20.0.0",
+    "sinon": "21.0.0",
     "tempy": "3.1.0"
   },
   "engines": {