chore: Fix unresolvable_did test case, which timed out for some users

[scouten-adobe]

(Replace test asset with a new one that points to a different site.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.03%. Comparing base (689f40d) to head (b76a8e4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1288      +/-   ##
==========================================
+ Coverage   77.99%   78.03%   +0.03%     
==========================================
  Files         150      150              
  Lines       38328    38328              
==========================================
+ Hits        29895    29910      +15     
+ Misses       8433     8418      -15     

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