Fix usage of (s) instead of correct plural and singular in collection logs.

[tobiasraabe]

No description provided.

[codecov]

Codecov Report

Merging #50 (aaadc88) into main (19f0fe6) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   89.41%   89.41%           
=======================================
  Files          54       54           
  Lines        4431     4431           
=======================================
  Hits         3962     3962           
  Misses        469      469           

Flag	Coverage Δ
end_to_end	75.10% <100.00%> (ø)
integration	41.70% <0.00%> (ø)
unit	68.81% <50.00%> (ø)

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Impacted Files	Coverage Δ
src/_pytask/collect.py	94.48% <100.00%> (ø)

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