fix: External resources not discovered within subresources of local $ref targets

[Stranger6667]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.13%. Comparing base (9062783) to head (f6f879a).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/jsonschema-referencing/src/registry.rs	94.73%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #895   +/-   ##
=======================================
  Coverage   94.12%   94.13%           
=======================================
  Files          78       78           
  Lines       16534    16590   +56     
=======================================
+ Hits        15563    15617   +54     
- Misses        971      973    +2     

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[codspeed-hq]

CodSpeed Performance Report

Merging #895 will not alter performance

_{Comparing dd/discover-refs-in-subresources (f6f879a) with master (9062783)}

Summary

✅ 61 untouched