gistfile1.txt

kenyon@lithium ~/git/puppet-smokeping (master|u+2) % ruby --version
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux-gnu]

kenyon@lithium ~/git/puppet-smokeping (master|u+2) % bundle install
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Fetching gem metadata from https://rubygems.org/.......
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Bundler could not find compatible versions for gem "puppet-modulebuilder":
  In snapshot (Gemfile.lock):
    puppet-modulebuilder (= 1.0.0)

  In Gemfile:
    voxpupuli-release (~> 3.0) was resolved to 3.0.0, which depends on
      puppet-blacksmith (~> 7.0) was resolved to 7.0.0, which depends on
        puppet-modulebuilder (~> 1.0)

    voxpupuli-acceptance (~> 3.5) was resolved to 3.5.1, which depends on
      puppet-modulebuilder (>= 2.0.2, ~> 2.0)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

kenyon@lithium ~/git/puppet-smokeping (master|u+2) % bundle update
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Fetching gem metadata from https://rubygems.org/.......
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies.......
ffi-1.17.2-x86_64-linux-musl requires rubygems version >= 3.3.22, which is incompatible with the current version, 3.3.15

A fresh git clone and then bundle install worked around this. 🤷

Removing Gemfile.lock is the actual fix.