[graph] remove the Data.Sequence quickfix

We are back to using original "sequences" package, it seems to work
OK (except the recursion error is still thrown, but that was also with
Data.Array).
2 jobs for 465-dev-graph-explorer-recursion-error in 0 seconds (queued for 103 minutes and 35 seconds)
Status Job ID Name Coverage
  Test
failed #5442
deps

failed #5443
test

 
Name Stage Failure
failed
test Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace
failed
deps Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace