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.