Update to latest goflow and rename some remaining call variables

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #665 (ac2eb1c) into main (b726dbd) will not change coverage.
The diff coverage is 58.33%.

@@           Coverage Diff           @@
##             main     #665   +/-   ##
=======================================
  Coverage   62.28%   62.28%           
=======================================
  Files         132      132           
  Lines       12883    12883           
=======================================
  Hits         8024     8024           
  Misses       3996     3996           
  Partials      863      863           

Impacted Files	Coverage Δ
core/models/sessions.go	54.96% <0.00%> (ø)
services/ivr/twiml/service.go	29.65% <0.00%> (ø)
core/tasks/handler/worker.go	52.28% <20.00%> (ø)
services/ivr/vonage/service.go	29.81% <75.00%> (ø)
web/ivr/ivr.go	42.64% <100.00%> (ø)
web/simulation/simulation.go	60.00% <100.00%> (ø)

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