chore(deps-dev): update rbs requirement from 4.0.3 to 4.1.2

[dependabot]

Updates the requirements on rbs to permit the latest version.

Release notes

Sourced from rbs's releases.

4.1.2

Release note

Miscellaneous

• Keep GC disabled during GC_test#test_stress_and_stress= (#3061)
• Fix GC_test#test_enable leaving GC disabled for the rest of the suite (#3059)

Changelog

Sourced from rbs's changelog.

4.1.2 (2026-08-03)

Miscellaneous

• Keep GC disabled during GC_test#test_stress_and_stress= (#3061)
• Fix GC_test#test_enable leaving GC disabled for the rest of the suite (#3059)

4.1.1 (2026-07-30)

Library changes

• Include the trailing ? in a keyword key's symbol location (#3043)
• Mark type_name as optional on the alias annotations (#3039)

Miscellaneous

• Fix template drift for ext/rbs_extension/ast_translation.c (#3038)

4.1.0 (2026-07-27)

RBS 4.1 ships with JRuby support. The RBS parser is written in plain C without depending on the Ruby C API, so it is compiled to WebAssembly and runs on a Wasm runtime, with the parsed AST serialized in a binary format and decoded into RBS objects. The full test suite runs on JRuby in CI.

The inline RBS syntax gets three new features: singleton method definitions (def self.), the module-self constraint, and instance variable annotations in module declarations. Note that RBS inline is still experimental and may change in future releases.

This release also introduces RBS::Rewriter, an API to edit RBS source text while preserving the surrounding content, which rbs annotate is now built on. Parsing performance is improved by interning type names in a shared trie and reducing allocations per node.

RBS::Prototype::Runtime, the RDoc plugin parser, and the top-level float type alias are deprecated in this release.

Signature updates

Updated classes/modules/methods: ARGF, Array, CSV, Class, Delegator, Digest, ERB, Enumerable, Enumerator, Enumerator::Product, Etc, File, File::Constants, File::Stat, FileUtils, Float, Gem, Hash, IO, IPAddr, Integer, JSON, Kernel, MatchData, Module, Monitor, Numeric, ObjectSpace::WeakKeyMap, OpenSSL, Pathname, RBS::Ops, Ractor, Range, Resolv, RubyVM::InstructionSequence, Set, Shellwords, String, StringIO, StringScanner, Struct, Tempfile, Thread, Timeout, TSort, URI::Generic, Zlib::GzipReader, Zlib::ZStream

• Remove stale Float constants and add a constant drift test (#2994)
• Update RDoc comments with Ruby 4.0.6 (#3035)
• Add a dependency on tempfile. (#3025)
• Support %a{implicitly-returns-nil} on MatchData#[] (#2990)
• Update Array (#2987)
• Allow nil output buffers for reader methods (#3002)
• Add stdlib signature tests for #2967 (#2989)
• Update Integer, phase 1 (#2995)
• Add RBS::Ops (#2934)
• Update Module (#2933)
• Correct core/stdlib signatures to match Ruby 4.0 (#2967)
• Revert Digest::Class method changes (#2980)
• Add stdlib tests for updated StringScanner signatures (#2968)
• Update StringScanner signatures to match strscan 3.1.6 (#2959)
• Remove StringScanner methods absent from the latest Ruby release (#2961)
• Fix Resolv#initialize signature: array of resolvers + use_ipv6: (#2960)
• [Hash] Update Hash's signatures and tests to be correct (#2694)
• update rbs signatures to be more consistent with generics (#2867)

... (truncated)

Commits

• 2c39462 Merge pull request #3062 from ruby/claude/release-4-1-2-hurcyr
• d710ede Version 4.1.2
• c95a7c9 Merge pull request #3061 from ruby/claude/gc-stress-test-performance-424sfy
• 1630d1f Keep GC disabled during GC_test#test_stress_and_stress=
• 7534c7e Merge pull request #3059 from ko1/fix-gc-test-enable-restore
• 75bcf93 Fix GC_test#test_enable leaving GC disabled for the rest of the suite
• c6eaca2 Merge pull request #3058 from ruby/claude/release-doc-new-minor
• a8913a8 Document the JRuby container, and correct what pins the jar versions
• 1da55ae Remove the release path that predates the release workflow
• 34b1188 Say what the version on master means
• Additional commits viewable in compare view