security: replace github.com/lestrrat-go/jwx/v2 with github.com/lestrrat-go/jwx/v4

[denopink]

github.com/lestrrat-go/jwx/v2 is deprecated: github.com/lestrrat-go/jwx/v2 is no longer maintained.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.71%. Comparing base (4ce3d44) to head (859ab70).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
basculehash/validator.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #507      +/-   ##
==========================================
- Coverage   99.85%   99.71%   -0.15%     
==========================================
  Files          30       30              
  Lines         696      699       +3     
==========================================
+ Hits          695      697       +2     
- Misses          1        2       +1     

Flag	Coverage Δ
unittests	99.71% <88.88%> (-0.15%)	⬇️

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