chore(deps): update dependency sinon to v15

Author: renovate[bot]

package-lock.json

@@ -27,7 +27,7 @@
     "mocha": "8.4.0",
     "nock": "13.2.0",
     "nyc": "15.1.0",
-    "sinon": "11.1.1",
+    "sinon": "15.0.3",
     "standard": "16.0.3",
     "standard-version": "9.3.1"
   },