Fix bundler version failure with ruby 2.7

[agrare]

The kubeclient actions.yml was manually installing rake and bundler overriding what ruby/setup-ruby was installing. This would attempt to install the latest version of bundler which is not supported on ruby 2.7 so the gem install was failing [ref]

Run gem install rake bundler
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.
Successfully installed rake-13.2.0
1 gem installed
Error: Process completed with exit code 1.

ruby/setup-ruby will install the correct bundler for the version of ruby requested.

[agrare]

NOTE there are some legitimate test failures on master so this PR will be red, but all specs should run where before the 2.7 runs would fail to start

[agrare]

Test failures fixed by #632

[Fryguy]

Agree with @agrare to merge on red.