Update dependency mocha to v11

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
     "eslint": "^7.0.0",
     "eslint-config-taskcluster": "^4.0.0",
     "lodash": "^4.17.15",
-    "mocha": "8.4.0"
+    "mocha": "11.6.0"
   },
   "dependencies": {
     "fast-json-stable-stringify": "^2.1.0"