fix: Add missing MessageFlag

[silasary]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

Polls added a reference to this flag in #1376, but presumably forgot to commit the file.

Changes

Add message flag for voice messages

Related Issues

Test Scenarios

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +12.80 🎉

Comparison is base (ac95d48) 47.52% compared to head (3cc01bf) 60.33%.

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Additional details and impacted files

@@              Coverage Diff              @@
##           unstable    #1382       +/-   ##
=============================================
+ Coverage     47.52%   60.33%   +12.80%     
=============================================
  Files           139      139               
  Lines         14581    14583        +2     
=============================================
+ Hits           6930     8799     +1869     
+ Misses         7651     5784     -1867     

Impacted Files	Coverage Δ
interactions/models/discord/enums.py	96.59% <100.00%> (+0.01%)	⬆️

... and 65 files with indirect coverage changes

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