feat: jwt KeyFunc external return

[songzhibin97]

returned by external dependencies, i.e.: KeyFunc

[codecov-commenter]

Codecov Report

Merging #2809 (533f280) into main (520b321) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

❗ Current head 533f280 differs from pull request most recent head 408ae07. Consider uploading reports for the commit 408ae07 to get more accurate results

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@@            Coverage Diff             @@
##             main    #2809      +/-   ##
==========================================
- Coverage   84.52%   84.48%   -0.05%     
==========================================
  Files          88       88              
  Lines        3923     3925       +2     
==========================================
  Hits         3316     3316              
- Misses        432      434       +2     
  Partials      175      175              

Impacted Files	Coverage Δ
middleware/auth/jwt/jwt.go	86.07% <0.00%> (-2.24%)	⬇️