Run CI against Ruby 3.2

[koheisg]

No description provided.

[koheisg]

Suggested change

	x = if RUBY_VERSION >= "3.2.0"
	Data.define(:to_hash).new(:to_hash => { "accept" => "json" })
	else
	Struct.new(:to_hash).new({ "accept" => "json" })
	end
	Struct.new(:to_hash, keyword_init: false).new("accept" => "json")

If this is the case, the code will not branch by version, but keyword_init: false will cause rubocop to say `Use hash rockets syntax.

[tarcieri]

@koheisg a separate issue, but it's probably about time we changed from hashrockets to keyword args in general

[koheisg]

@tarcieri OK ruby 3.2 support first! Thanks.