feat(backport): Use 'method' arg for jax.numpy.percentile

[meeseeksmachine]

Backport PR #2522: feat: Use 'method' arg for jax.numpy.percentile

* Backport PR https://github.com/scikit-hep/pyhf/pull/2522.
* Change the argument name in jax.numpy.percentile from 'interpolation' to 'method'.
  No change to the lower bounds on jax and jaxlib is required as 'method' already
  existed as an argument in jax v0.4.1. This just deprecates the use of 'interpolation'.

Co-authored-by: Matthew Feickert <matthew.feickert@cern.ch>

[codecov]

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##             release/v0.7.x    #2524   +/-   ##
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  Coverage                  ?   98.19%           
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  Files                     ?       69           
  Lines                     ?     4547           
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  Hits                      ?     4465           
  Misses                    ?       49           
  Partials                  ?       33           

Flag	Coverage Δ
contrib	97.73% <100.00%> (?)
doctest	98.02% <100.00%> (?)
unittests-3.10	96.19% <100.00%> (?)
unittests-3.11	96.19% <100.00%> (?)
unittests-3.12	96.19% <100.00%> (?)
unittests-3.7	96.17% <100.00%> (?)
unittests-3.8	96.21% <100.00%> (?)
unittests-3.9	96.23% <100.00%> (?)

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