Fixes PythonExceptionStackParser
Fixes PythonExceptionStackParser

`PythonExceptionStackParser` was wrongly replacing all `in` string for `at` where it should only replace the first occurence.

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