Fix non-deterministic enumeration in SubscriptionCollection
Fix non-deterministic enumeration in SubscriptionCollection

AnshulYADAV007/Lean,kaffeebrauer/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,jameschch/Lean,kaffeebrauer/Lean,Jay-Jay-D/LeanSTP,Jay-Jay-D/LeanSTP,AlexCatarino/Lean,AlexCatarino/Lean,Jay-Jay-D/LeanSTP,jameschch/Lean,StefanoRaggi/Lean,JKarathiya/Lean,AnshulYADAV007/Lean,AnshulYADAV007/Lean,Jay-Jay-D/LeanSTP,QuantConnect/Lean,JKarathiya/Lean,Jay-Jay-D/LeanSTP,jameschch/Lean,AnshulYADAV007/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,kaffeebrauer/Lean,jameschch/Lean,AnshulYADAV007/Lean,JKarathiya/Lean,QuantConnect/Lean,jameschch/Lean,QuantConnect/Lean,QuantConnect/Lean,JKarathiya/Lean,AlexCatarino/Lean