FI-3112: Fixed JWKS Template Path Used in Unit Tests

[vanessuniq]

Summary

Reading the jwks.json template in spec using relative path raised a no file error when using the gem in test kit test environment. This PR updates the jwks path to the correct absolute path.

Testing Guidance

Test by pointing inferno_core gem to this branch and ensure no error when executing rspec.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.86%. Comparing base (d4a676c) to head (7addd7a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #526   +/-   ##
=======================================
  Coverage   79.86%   79.86%           
=======================================
  Files         253      253           
  Lines       13351    13351           
  Branches     1290     1290           
=======================================
  Hits        10663    10663           
  Misses       1939     1939           
  Partials      749      749           

Flag	Coverage Δ
backend	91.84% <ø> (ø)
frontend	74.54% <ø> (ø)

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