Pin DigitalOcean spec index test to a specific commit hash

[martinsirbe]

This PR addresses a failing test caused by changes in the upstream repository digitalocean/openapi. The test depended on the number of files in the specification directory, causing it to break whenever files were added or removed. This fix pins the DigitalOcean spec index test to a specific commit hash to ensure consistent test results.

Impact

• Stability: Tests will no longer break due to changes in the number of files in the upstream repository.
• Reliability: Ensures consistent and predictable test outcomes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.63%. Comparing base (382557c) to head (1c73d69).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #296      +/-   ##
==========================================
- Coverage   99.65%   99.63%   -0.02%     
==========================================
  Files         162      162              
  Lines       16101    16101              
==========================================
- Hits        16045    16043       -2     
- Misses         51       53       +2     
  Partials        5        5              

Flag	Coverage Δ
unittests	99.63% <ø> (-0.02%)	⬇️

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[daveshanley]

Thank you!