refactor(cookie): fix alias binding of SameSite::Empty to None

[0x676e67]

Ruby does not have a None type like Python.
Therefore, creating an alias that maps SameSite::Empty to None is unnecessary and may even cause confusion, since Ruby conventions typically use nil to represent the absence of a value.
To keep the API consistent with Ruby’s type system and avoid implying Python-style semantics, the alias has been removed / corrected accordingly.

[Copilot]

Pull Request Overview

This PR refactors the SameSite cookie attribute by renaming the Empty variant to None, aligning it with the underlying Rust cookie crate's enum and standard cookie semantics.

Key Changes:

• Renamed SameSite::Empty to SameSite::None in the Rust enum definition
• Updated constant registration to expose SameSite::None instead of SameSite::Empty
• Updated Ruby stub documentation to reflect the None constant

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/cookie.rs	Updated define_ruby_enum! macro invocation to use None variant instead of tuple mapping (Empty, None), and updated constant registration from Empty to None
lib/wreq_ruby/cookie.rb	Renamed Ruby constant from Empty to None and updated associated documentation comment

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