Debug CI: Try nthreads=5,6,7

[tkf]

#3

[codecov]

Codecov Report

Merging #4 (e87a486) into main (09fe663) will not change coverage.
The diff coverage is 100.00%.

❗ Current head e87a486 differs from pull request most recent head 5172f04. Consider uploading reports for the commit 5172f04 to get more accurate results

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   95.55%   95.55%           
=======================================
  Files           2        2           
  Lines          90       90           
=======================================
  Hits           86       86           
  Misses          4        4           

Flag	Coverage Δ
Pkg.test	95.55% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/core.jl	95.34% <100.00%> (ø)

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