fix: update image for singer zendesk support to v8.3.9

[am6010]

What are the changes introduced in this PR?

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What is the related Linear task?

Resolves INT-XXX

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Any new dependencies introduced with this change?

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Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

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• All changes manually tested?

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• I have executed schemaGenerator tests and updated schema if needed

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• Is the PR limited to 10 file changes & one task?

Reviewer checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                 Coverage Diff                 @@
##             hotfix/03102024     #1731   +/-   ##
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  Coverage                   ?   100.00%           
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  Files                      ?         2           
  Lines                      ?        53           
  Branches                   ?         7           
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  Hits                       ?        53           
  Misses                     ?         0           
  Partials                   ?         0           

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