fix(ci): Remove GitHub Discussions from release workflow

[soulevilx]

Summary

• Remove discussion_category_name from the release workflow because GitHub Discussions is not enabled on this repository.
• Fixes the v1.4.0 release workflow failure during release finalization.

Test plan

• CI passes on this PR
• Re-tag v1.4.0 after merge and verify Release + Packagist jobs succeed

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.31%. Comparing base (6cdfc61) to head (8061063).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #23   +/-   ##
=========================================
  Coverage     98.31%   98.31%           
  Complexity      726      726           
=========================================
  Files            61       61           
  Lines          1726     1726           
=========================================
  Hits           1697     1697           
  Misses           29       29           

Flag	Coverage Δ
unittests	98.31% <ø> (ø)

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