Downgrade sinon

Versions of sinon >= 11 is incompatible with Node.js v10, which breaks
the ci tests.

Author: Hornwitser

package.json

@@ -14,7 +14,7 @@
     "fs-jetpack": "^4",
     "sequelize": "^6",
     "@sequelize/core": "latest",
-    "sinon": "^13",
+    "sinon": "^10",
     "sinon-chai": "^3"
   },
   "scripts": {