misc(ruby): Bump ruby to 4.0.2

[vincent-pochet]

No description provided.

[Copilot]

Pull request overview

Updates the Ruby binding/tooling configuration for the expression-ruby component to target a newer Ruby patch release and align native-extension build dependencies accordingly.

Changes:

• Bump pinned Ruby version from 4.0.1 to 4.0.2 across local dev tooling, Bundler, gemspec, and CI.
• Update rb_sys dependency to ~> 0.9.124 (and corresponding lockfile updates, including rake-compiler-dock).

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
expression-ruby/lago-expression.gemspec	Updates required Ruby version and bumps rb_sys dependency.
expression-ruby/Gemfile.lock	Updates locked native-build dependencies and the recorded Ruby version.
expression-ruby/Gemfile	Pins Bundler Ruby version to 4.0.2.
.tool-versions	Pins asdf Ruby toolchain version to 4.0.2.
.github/workflows/ruby.yml	Updates CI to run against Ruby 4.0.2.

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