DM-32976: Use copy instead of copy2.

[ktlim]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #3 (62c5206) into main (2359392) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   84.94%   84.94%           
=======================================
  Files          15       15           
  Lines        2046     2046           
  Branches      293      293           
=======================================
  Hits         1738     1738           
  Misses        218      218           
  Partials       90       90           

Impacted Files	Coverage Δ
python/lsst/resources/file.py	73.65% <100.00%> (ø)

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