ci: bump @types/sinon from 20.0.0 to 21.0.0 (#749)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "@types/chai": "^5.0.0",
     "@types/mocha": "^10.0.10",
     "@types/node": "^24.0.7",
-    "@types/sinon": "^20.0.0",
+    "@types/sinon": "^21.0.0",
     "@types/sinon-chai": "^4.0.0",
     "@types/yargs": "^17.0.33",
     "ajv": "^8.17.1",