chore: raise the jwt provider limit to 16

[zhaohuabing]

This PR raises the limit of JWT providers to 16.

Fixes #8540

Release Notes: Yes

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.12%. Comparing base (cc23457) to head (2c0d6c4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8543      +/-   ##
==========================================
+ Coverage   74.10%   74.12%   +0.01%     
==========================================
  Files         242      242              
  Lines       37638    37638              
==========================================
+ Hits        27893    27898       +5     
+ Misses       7790     7787       -3     
+ Partials     1955     1953       -2     

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