fix(versioning): webhooks not triggered when new version published

[matthewelwell]

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Changes

Fixes an issue calling the call_environment_webhooks function with the environment object instead of its id attribute.

How did you test this code?

Update existing unit test.

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 9:44am
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 9:44am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 9:44am

[github-actions]

Uffizzi Preview deployment-51749 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.00%. Comparing base (06eb8a4) to head (face933).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3953   +/-   ##
=======================================
  Coverage   96.00%   96.00%           
=======================================
  Files        1135     1135           
  Lines       36380    36380           
=======================================
  Hits        34928    34928           
  Misses       1452     1452           

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