Add missing Deployment field to workflow_job event type

[AirOne70]

The workflow_job webhook event as described by GitHub documentation contains a deployment object.
https://docs.github.com/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#workflow_job

However, the struct that defines the workflow_job webhook event type is missing the deployment object . This PR adds the missing object to the WorkflowJobEvent type.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.30%. Comparing base (2b8c7fa) to head (dc752c2).
Report is 174 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3353      +/-   ##
==========================================
- Coverage   97.72%   92.30%   -5.42%     
==========================================
  Files         153      176      +23     
  Lines       13390    15031    +1641     
==========================================
+ Hits        13085    13874     +789     
- Misses        215     1064     +849     
- Partials       90       93       +3     

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[gmlewis]

Thank you, @AirOne70 !
LGTM.
Merging.