chore(ncu-ci)!: remove --copy flag

[aduh95]

Removes the dependency on clipboardy. Instead, pass the --markdown flag and pipe the result to e.g. pbcopy

Closes: #1131

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.19%. Comparing base (cb00ed8) to head (adb1bdf).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1140      +/-   ##
==========================================
- Coverage   57.19%   57.19%   -0.01%     
==========================================
  Files          53       53              
  Lines       10368    10367       -1     
==========================================
- Hits         5930     5929       -1     
  Misses       4438     4438              

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[Renegade334]

Definite +1 here, depending on unauditable binaries is not an enviable position for this package to be in.