Updated sinon dependency

- this is being done manually instead of merging the Renovate PR because
  the PR bundles another bump which doesn't pass yet

Author: daniellockyer

packages/members-csv/package.json

@@ -19,7 +19,7 @@
     "c8": "7.13.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
-    "sinon": "14.0.2"
+    "sinon": "15.0.1"
   },
   "dependencies": {
     "fs-extra": "11.1.0",