chore(simple-metrics): add sinon-ts devDependency for dep-check

Author: Nkovaturient

packages/metrics-simple/package.json

@@ -49,7 +49,8 @@
   "devDependencies": {
     "@types/tdigest": "^0.1.5",
     "aegir": "^47.0.22",
-    "p-defer": "^4.0.1"
+    "p-defer": "^4.0.1",
+    "sinon-ts": "^2.0.0"
   },
   "sideEffects": false
 }