chore: resolve open dependabot security alerts

[jonathannorris]

Summary

• Bumped erb from 6.0.2 to 6.0.4 to resolve a high-severity vulnerability (alert [CI/CD] Use reusable workflow #13): ERB has an @_init deserialization guard bypass via def_module / def_method / def_class
• Bumped Bundler (BUNDLED WITH) from 4.0.6 to 4.0.12 to fix the failing Ruby head CI job

Notes

The Ruby head matrix job was failing with NameError: uninitialized constant Pathname::SEPARATOR_PAT during bundle install. This is an upstream incompatibility, not a problem in this repo: Pathname::SEPARATOR_PAT was an internal constant accidentally left public, and Ruby 4.1-dev (ruby-head) made it private, which broke Bundler 4.0.6's Source::Path#generate_bin. Fixed upstream in ruby/rubygems#9529 and shipped in Bundler 4.0.12, so the lockfile just needed the bump.

Verified locally on Ruby 4.0.5 / Bundler 4.0.12: bundle install, bundle exec rspec (420 examples, 0 failures), and bundle exec standardrb all pass.

[gemini-code-assist]

Code Review

This pull request updates the erb gem version from 6.0.2 to 6.0.4 in the Gemfile.lock. I have no feedback to provide as there are no review comments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.50%. Comparing base (0e986fd) to head (d49a1de).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #281   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          31       31           
  Lines         808      808           
=======================================
  Hits          804      804           
  Misses          4        4           

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