docs: Update dev/release/README.md for new crate datafusion-proto-models

[alamb]

Which issue does this PR close?

• Follow on to Release DataFusion 55.0.0 (Jul / Aug 2026) #22393

Rationale for this change

A new crate was added, datafusion-proto-models that needs to be published

What changes are included in this PR?

Update publishing instructions

Are these changes tested?

I tested them manually

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.21%. Comparing base (19f2e85) to head (b264ab8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24472      +/-   ##
==========================================
- Coverage   81.22%   81.21%   -0.01%     
==========================================
  Files        1113     1113              
  Lines      392250   392250              
  Branches   392250   392250              
==========================================
- Hits       318596   318580      -16     
- Misses      54910    54921      +11     
- Partials    18744    18749       +5     

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[adriangb]

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