checks: fix evaluation against latest run in base

[bobheadxi]

Evaluation currently takes the oldest run, not the latest 😬 Closes #70

[codecov]

Codecov Report

Base: 30.32% // Head: 30.19% // Decreases project coverage by -0.13% ⚠️

Coverage data is based on head (ec928b4) compared to base (c898384).
Patch coverage: 66.67% of modified lines in pull request are covered.

❗ Current head ec928b4 differs from pull request most recent head e25e068. Consider uploading reports for the commit e25e068 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   30.32%   30.19%   -0.12%     
==========================================
  Files           9        9              
  Lines         475      477       +2     
==========================================
  Hits          144      144              
- Misses        315      316       +1     
- Partials       16       17       +1     

Impacted Files	Coverage Δ
checks/evaluate.go	67.35% <50.00%> (-2.04%)	⬇️
bench/benchmark.go	58.34% <100.00%> (+8.34%)	⬆️

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