Specialize unchecked_oneto

[jishnub]

On upcoming julia versions, Base occasionally uses unchecked_oneto where it used to previously use oneto. This requires us to specialize unchecked_oneto as well to get tests to pass.

See JuliaLang/julia#52481

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.00%. Comparing base (377308c) to head (cadca2a).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/infrange.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   86.04%   86.00%   -0.05%     
==========================================
  Files           6        6              
  Lines         738      743       +5     
==========================================
+ Hits          635      639       +4     
- Misses        103      104       +1     

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[jishnub]

This method can't be tested on current versions, as it is only added for an upcoming version. It should be tested already on the upcoming versions, as the tests on nightly fail without this.