Ruby 2.7 is deprecated, failing to even have support in the latest bundler versions. Removing ruby 2.7 from the CI test matrix should be considered since it is failing:
ERROR: Error installing bundler:
The last version of bundler (>= 0) to support your Ruby & RubyGems was 2.4.22. Try installing it with `gem install bundler -v 2.4.22`
bundler requires Ruby version >= 3.0.0. The current ruby version is 2.7.8.225.
Ruby 2.7 is deprecated, failing to even have support in the latest bundler versions. Removing ruby 2.7 from the CI test matrix should be considered since it is failing: