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Require Ruby 3.3.1 (#2966)

Ruby 3.3.0 rejects forwarding an anonymous parameter from inside a block:

    def compose_message(key, **)
      MESSAGE_STEPS.filter_map { |step, _| translate_message(:"#{key}.#{step}", **) }
    end
    # 3.3.0: anonymous keyword rest parameter is also used within block (SyntaxError)

Its forwarding_arg_check moved up to the enclosing scope before looking for
an anonymous parameter, so it found the method's own `**` and reported a
conflict for any block. 3.3.1 fixed it (ruby 2a84aaf4a8, backporting
596db9c1f4, [Feature #19370] "Blocks without anonymous parameters should
not affect"); only a block that declares an anonymous parameter of its own
is rejected now, on every version.

lib/grape/exceptions/base.rb has done this since 3.2.0, and Grape loads
every file up front, so no release since has loaded on Ruby 3.3.0 while
the gemspec allowed it. CI's 3.3 job runs the latest 3.3.x, which is why
nothing flagged it.

required_ruby_version is now '>= 3.3.1'. With that floor, the remaining
named arguments that were only forwarded are forwarded anonymously, and
RuboCop skips tmp/.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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