chore: Update to c2pa-rs v0.76.1

[redaranj]

Changes in this pull request

• Updates c2pa-rs to v0.76.1
• Updates CI to allow beta releases

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• All applicable changes have been documented
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.29%. Comparing base (11d2f20) to head (db3df19).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   81.35%   81.29%   -0.06%     
==========================================
  Files          46       46              
  Lines        1754     1754              
==========================================
- Hits         1427     1426       -1     
- Misses        327      328       +1     

Flag	Coverage Δ
unittests	81.29% <ø> (-0.06%)	⬇️

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