Rework the way the circled references are determine to avoid false-positive results

[OptimumCode]

Resolves #49

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (e867a0c) 90.16% compared to head (19bf89b) 90.03%.

Files	Patch %	Lines
...ub/optimumcode/json/pointer/internal/extensions.kt	33.33%	1 Missing and 3 partials ⚠️
...mumcode/json/schema/internal/ReferenceValidator.kt	86.95%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   90.16%   90.03%   -0.13%     
==========================================
  Files          90       90              
  Lines        2033     2058      +25     
  Branches      499      509      +10     
==========================================
+ Hits         1833     1853      +20     
- Misses         41       42       +1     
- Partials      159      163       +4     

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