Upgrade to Avro 1.11.5

[clairemcginty]

http://avro.apache.org/blog/2025/10/16/avro-1.11.5/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.56%. Comparing base (4daeffd) to head (e37e040).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5799   +/-   ##
=======================================
  Coverage   61.56%   61.56%           
=======================================
  Files         314      314           
  Lines       11343    11343           
  Branches      807      807           
=======================================
  Hits         6983     6983           
  Misses       4360     4360           

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