[infra] Fix build pipeline

[Kielek]

Fixes issue from: https://github.com/open-telemetry/opentelemetry-dotnet/actions/runs/21203966242/job/60996304682

Changes

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Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• [ ] Unit tests added/updated
• [ ] Appropriate CHANGELOG.md files updated for non-trivial changes
• [ ] Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.76%. Comparing base (c602d81) to head (4005612).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6847      +/-   ##
==========================================
- Coverage   86.84%   86.76%   -0.09%     
==========================================
  Files         263      263              
  Lines       12382    12382              
==========================================
- Hits        10753    10743      -10     
- Misses       1629     1639      +10     

Flag	Coverage Δ
unittests-Project-Experimental	86.71% <ø> (-0.05%)	⬇️
unittests-Project-Stable	86.46% <ø> (-0.26%)	⬇️
unittests-Solution	86.68% <ø> (-0.02%)	⬇️
unittests-UnstableCoreLibraries-Experimental	86.43% <ø> (+0.36%)	⬆️

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see 4 files with indirect coverage changes