input `bundler: 2.7.2` didn't run `bundle lock` with the correct version

[dentarg]

Ensure the following before filing this issue

• I verified it reproduces with the latest version with - uses: ruby/setup-ruby@v1 (see Versioning policy)

• I tried to reproduce the issue locally by following the workflow steps (including all commands done by ruby/setup-ruby, except for Downloading Ruby & Extracting Ruby),
  and it did not reproduce locally (if it does reproduce locally, it's not a ruby/setup-ruby issue)

Are you running on a GitHub-hosted runner or a self-hosted runner?

GitHub-hosted runner

Link to the failed workflow job (must be a public workflow job, so the necessary information is available)

https://github.com/sinatra/sinatra/actions/runs/20523194500/job/58961833171?pr=2136#step:4:4

Any other notes?

• Here the bundler: input is set to 2.72.: https://github.com/sinatra/sinatra/actions/runs/20523194500/job/58961833171?pr=2136#step:4:4
• Here bundler 2.7.2 is installed: https://github.com/sinatra/sinatra/actions/runs/20523194500/job/58961833171?pr=2136#step:4:32
• but BUNDLED WITH in the generated lockfile is 4.0.3 https://github.com/sinatra/sinatra/actions/runs/20523194500/job/58961833171?pr=2136#step:4:487