Update to latest goflow

[rowanseymour]

Doesn't include changes to load contact tickets yet...

[codecov]

Codecov Report

Merging #423 (7722513) into main (a6bfdd4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #423      +/-   ##
==========================================
+ Coverage   54.67%   54.68%   +0.01%     
==========================================
  Files         116      116              
  Lines        8165     8168       +3     
==========================================
+ Hits         4464     4467       +3     
  Misses       2985     2985              
  Partials      716      716              

Impacted Files	Coverage Δ
core/goflow/engine.go	95.91% <100.00%> (ø)
core/models/contacts.go	62.29% <100.00%> (+0.06%)	⬆️
services/tickets/intern/service.go	100.00% <100.00%> (ø)
services/tickets/mailgun/service.go	92.40% <100.00%> (+0.09%)	⬆️
services/tickets/rocketchat/service.go	100.00% <100.00%> (ø)
services/tickets/zendesk/service.go	85.71% <100.00%> (ø)

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