feat: handle ABI version suffix in Ruby HEAD

[pboling]

• lock in ruby_version/RUBY_VERSION +N parsing
• keep MAJOR/MINOR/TEENY strict numeric parsing
• add version.rs coverage for ruby_version suffix case

Closes #705
See: matsadler/magnus#167

Related: #703

[Copilot]

Pull request overview

This PR updates rb-sys’s environment/version handling to correctly support Ruby’s new +N ABI suffix while keeping strict numeric parsing for discrete MAJOR/MINOR/TEENY env vars, and adds tests to lock in the expected behavior.

Changes:

• Bump internal crate versions in the fuzz workspace lockfile to align with the new rb-sys and helper crate versions.
• Add a build-script test to ensure Version::current correctly parses ruby_version strings with a +N suffix.
• Extend RubyVersion::from_raw_environment to parse VERSION/ruby_version/RUBY_VERSION values with suffixes via a new parse_version_component helper, while preserving strict numeric parsing for MAJOR/MINOR/TEENY, and add targeted tests for these cases.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
fuzz/Cargo.lock	Updates pinned versions of rb-sys, rb-sys-build, rb-sys-env, and test-helper crates to match the new crate versions used elsewhere.
crates/rb-sys/build/version.rs	Adds a unit test for Version::current to confirm that a ruby_version like 4.1.0+1 is parsed to Version::new(4, 1).
crates/rb-sys-env/src/ruby_version.rs	Adjusts environment-based Ruby version parsing to accept +N and similar suffixes on VERSION / ruby_version / RUBY_VERSION, introduces parse_version_component, and adds tests for suffix handling and for rejecting suffixed MAJOR.

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[gjtorikian]

thank you!