upgrade ruby and bundler version

[sensuikan1973]

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[gemini-code-assist]

Code Review

This pull request updates the .ruby-version file from 4.0.2 to 4.0.3. Feedback indicates that 4.0.3 is not a valid Ruby version, as the language is currently in the 3.x series, and using an invalid version will cause environment managers to fail.

[gemini-code-assist]

The version 4.0.3 is not a valid or released version of the Ruby programming language. As of now, Ruby is in the 3.x series (e.g., 3.3.6 or 3.4.1). Specifying a non-existent version in .ruby-version will cause environment managers like rbenv, rvm, or asdf to fail when attempting to install or switch to this version. Additionally, while the PR title mentions upgrading Bundler, there are no changes to Gemfile.lock or other Bundler-related configurations included in this diff.

3.3.6

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (67e06a5) to head (64fc08f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2917   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files          52       52           
  Lines        1483     1483           
=======================================
  Hits         1396     1396           
  Misses         87       87           

Flag	Coverage Δ
integration_test	64.93% <ø> (+0.40%)	⬆️
macos-latest	90.22% <ø> (+0.96%)	⬆️
ubuntu	93.59% <ø> (ø)
widget_test	90.28% <ø> (ø)
windows	93.45% <ø> (ø)

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