faster mask to bool casting in GeffTracksBuilder

[TeunHuijben]

The old mask.astype(bool) always makes a copy, even when the mask is already a bool, which is slow.

np.asarray(mask, dtype=bool) does the same casting, but without the copy when the type already matches > faster

Probably not detected in benchmark, but is a significant different on large graphs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.95%. Comparing base (1de5412) to head (30cf9b3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #294   +/-   ##
=======================================
  Coverage   93.95%   93.95%           
=======================================
  Files          60       60           
  Lines        3589     3589           
=======================================
  Hits         3372     3372           
  Misses        217      217           

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