chore(deps): update dependency @types/sinon to v21

Author: renovate[bot]

package-lock.json

@@ -335,7 +335,7 @@
         "@types/chai": "^4.3.20",
         "@types/mocha": "^10.0.10",
         "@types/node": "^24.2.1",
-        "@types/sinon": "^17.0.4",
+        "@types/sinon": "^21.0.0",
         "@types/sinon-chai": "^3.2.12",
         "@types/vscode": "^1.102.0",
         "@vscode/test-electron": "^2.5.2",