Remove single-argument map tests on nightly

[jishnub]

The single-argument map(f) method has been removed in JuliaLang/julia#52631, so the explicit tests for these need to be altered. These tests aren't directly related to this package, and were checking for type-piracy.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.90%. Comparing base (002f56c) to head (5d68950).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #358   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files           8        8           
  Lines        1043     1043           
=======================================
  Hits         1042     1042           
  Misses          1        1           

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[jishnub]

Gentle bump, would be good to have this merged