CI fails when using ruby-head.

[Kassy0220]

I forked the repository and pushed to the master branch to run CI, and found that the CI fails when using ruby-head.

error message.

Run git submodule update --init
Successfully installed bundler-1.17.3
1 gem installed
Fetching gem metadata from https://rubygems.org/.......
Resolving dependencies...
Could not find compatible versions

Because the current Bundler version (4.0.1) does not satisfy bundler < 3.0
  and Gemfile depends on bundler < 3.0,
  version solving has failed.

Your bundle requires a different version of Bundler than the one you're running.
Install the necessary version with `gem install bundler:2.7.2` and rerun bundler
using `bundle _2.7.2_ install`
Error: Process completed with exit code 6.

job screenshot.

workflow url: https://github.com/Kassy0220/holiday_jp-ruby/actions/runs/20189715794/job/57965429086#step:4:20