Limit searchsorted specializations to julia versions < v"1.12"

[jishnub]

These are unnecessary on a recent master, as the methods in Base correctly account for offset indices.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.46%. Comparing base (7d3ea6c) to head (14cfe68).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #364   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files           6        6           
  Lines         452      452           
=======================================
  Hits          436      436           
  Misses         16       16           

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