Update package.json - pin "sinon": "21.0.3",

Author: MarkDuckworth

handwritten/firestore/package.json

@@ -116,7 +116,7 @@
     "path-to-regexp": "^8.2.0",
     "protobufjs-cli": "^1.1.3",
     "proxyquire": "^2.1.3",
-    "sinon": "^21.0.0",
+    "sinon": "21.0.3",
     "through2": "^4.0.2",
     "ts-node": "^10.9.2",
     "typescript": "^5.9.2"