chore(deps): update dependency sinon to v21

Author: renovate-bot

.github/scripts/package.json

@@ -16,6 +16,6 @@
     "devDependencies": {
         "@octokit/rest": "^19.0.0",
         "mocha": "^10.0.0",
-        "sinon": "^18.0.0"
+        "sinon": "^21.0.0"
     }
 }

package.json

@@ -84,7 +84,7 @@
     "@types/extend": "^3.0.4",
     "@types/mocha": "^10.0.10",
     "@types/node": "^24.1.0",
-    "@types/sinon": "^17.0.4",
+    "@types/sinon": "^21.0.0",
     "@types/through2": "^2.0.41",
     "c8": "^10.1.3",
     "chai": "^4.5.0",