test: update test426 fixtures

[Trott]

Update test426 fixtures for source map tests.

Refs: https://github.com/tc39/source-map-tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (37d9cfc) to head (0faf752).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60982      +/-   ##
==========================================
+ Coverage   88.51%   88.53%   +0.02%     
==========================================
  Files         703      703              
  Lines      208430   208430              
  Branches    40198    40202       +4     
==========================================
+ Hits       184491   184543      +52     
+ Misses      15951    15892      -59     
- Partials     7988     7995       +7     

see 31 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70412/