fix(jwa): improve RFC9864 check key logic

[lepture]

Replacing #80

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (59918a1) to head (b8434cb).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #85   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         2852      2849    -3     
  Branches       321       320    -1     
=========================================
- Hits          2852      2849    -3     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Please retry analysis of this Pull-Request directly on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud