chore(deps): update arena dependency

This is just housekeeping, as the upgrade does not make any functional
changes.

Author: skeggse

package-lock.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "bee-queue": "^1.3.1",
     "bull": "^3.19.1",
-    "bull-arena": "^3.5.0",
+    "bull-arena": "^3.6.0",
     "bullmq": "^1.11.0",
     "nodemon": "^2.0.6"
   },