chore: Upgrade 'sinon' to v8

Author: medikoo

package.json

@@ -58,7 +58,7 @@
     "jest": "^26.0.1",
     "lint-staged": "^10.2.2",
     "prettier": "^2.0.5",
-    "sinon": "^7.5.0",
+    "sinon": "^8.1.1",
     "standard-version": "^7.1.0"
   },
   "scripts": {