Fix specs on TruffleRuby 22.0.0.2

[ms-ati]

Appears that TruffleRuby 22.0.0.2 reports RUBY_VERSION of 3.0.2,
but the observed behavior when we pass a hash final argument to
a method taking splat and double-splat arguments appears to be
the prior behavior of Ruby versions before 3.0.0.

[codecov]

Codecov Report

Merging #90 (e57f533) into main (20ee87f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #90   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           94        94           
=========================================
  Hits            94        94           

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