replace usages of copy_arrays with memmap

[zacharyburnett]

follow-on to asdf-format/asdf#1797

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.26%. Comparing base (eb9d316) to head (4e289c3).
Report is 19 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #503      +/-   ##
==========================================
- Coverage   87.28%   87.26%   -0.03%     
==========================================
  Files          22       21       -1     
  Lines        3821     3815       -6     
==========================================
- Hits         3335     3329       -6     
  Misses        486      486              

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[braingram]

It looks like the version check doesn't like dev versions:
https://github.com/spacetelescope/gwcs/actions/runs/9997771007/job/27635131897?pr=503#step:10:300
Would you change this to https://docs.astropy.org/en/stable/api/astropy.utils.introspection.minversion.html#minversion

[nden]

I cannot reproduce the failure locally with numpy 2.0, scipy 1.14.0 and astropy 6.1.1. The only difference as far as I can tell is locally I'm running it on MacOS Monterey. Can you set atol=1e-15 in the failing test?

[braingram]

I was able to replicate this and narrow it down to scipy 1.14.0.
Here's an issue:
#504
and a PR that adjusts the tolerances for the test:
#505