Update dependency sinon to v18 (#14)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -37,7 +37,7 @@
     "mocha": "^10.0.0",
     "nodemon": "^3.0.0",
     "npm-check-updates": "^16.14.20",
-    "sinon": "^11.1.2"
+    "sinon": "^18.0.0"
   },
   "dependencies": {
     "dotenv": "^16.0.0",