CI: Install a RubyGems 3.2.x for jruby-head, and ensure a Bundler 1.17.3 is available and used #514
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In order to dance around issues, I picked the very latest release of RubyGems to fix on, for jruby-head.
Also: Separately install Bundler 1.17.3 for that version of Ruby, and point out exactly which Bundler to use when running
bundle install. (Perhaps this last little thing can be omitted, I don't know, but – we are now green again.)