chore(deps-dev): bump sinon from 17.0.2 to 21.0.1 (#2487)

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Co-authored-by: Michael Brooks <mbrooks@slack-corp.com>

Author: dependabot[bot]

packages/rtm-api/package.json

@@ -59,7 +59,7 @@
     "chai": "^4",
     "mocha": "^10",
     "shx": "^0.3.2",
-    "sinon": "^17",
+    "sinon": "^21",
     "source-map-support": "^0.5.21",
     "ts-node": "^10",
     "typedoc": "^0.28.7",