Fix compatibility with bundler 4.x

[mnin]

We want to fix the compatibility with bundler 4.x here because we got this exception (for e.g. pg or google-protobuf or grpc gems.

Caching dependency records for project
  bundler
  * 0 bundler dependencies
bundler: failed to load command: licensed (/home/runner/work/project/project/vendor/bundle/ruby/4.0.0/bin/licensed)
/opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/materialization.rb:32:in 'Bundler::Materialization#dependencies': undefined method 'runtime_dependencies' for an instance of Licensed::Bundler::MissingSpecification (NoMethodError)

      (materialized_spec || specs.first).runtime_dependencies.map {|d| [d, platform] }
                                        ^^^^^^^^^^^^^^^^^^^^^
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/spec_set.rb:260:in 'block in Bundler::SpecSet#materialize_dependencies'
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/spec_set.rb:246:in 'Kernel#loop'
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/spec_set.rb:246:in 'Bundler::SpecSet#materialize_dependencies'
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/spec_set.rb:126:in 'Bundler::SpecSet#materialize'
	from /home/runner/work/project/project/vendor/bundle/ruby/4.0.0/bundler/gems/licensed-c4a2115b42ee/lib/licensed/sources/bundler/definition.rb:17:in 'Licensed::Bundler::DefinitionExtensions#specs'
	from /home/runner/work/project/project/vendor/bundle/ruby/4.0.0/bundler/gems/licensed-c4a2115b42ee/lib/licensed/sources/bundler.rb:54:in 'block in Licensed::Sources::Bundler#enumerate_dependencies'
	from /home/runner/work/project/project/vendor/bundle/ruby/4.0.0/bundler/gems/licensed-c4a2115b42ee/lib/licensed/sources/bundler.rb:110:in 'block in Licensed::Sources::Bundler#with_application_environment'
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/ui/shell.rb:177:in 'Bundler::UI::Shell#with_level'
	from /opt/hostedtoolcache/Ruby/4.0.0/x64/lib/ruby/gems/4.0.0/gems/bundler-4.0.3/lib/bundler/ui/shell.rb:122:in 'Bundler::UI::Shell#silence'
	from /home/runner/work/project/project/vendor/bundle/ruby/4.0.0/bundler/gems/licensed-c4a2115b42ee/lib/licensed/sources/bundler.rb:98:in 'Licensed::Sources::Bundler#with_application_environment'

[MikeMcQuaid]

@mnin A bunch of tests failing here. Should also add a new CI configuration for testing this on Bundler 4.

[mnin]

@MikeMcQuaid yes, thanks, not done yet with this PR.

[dgmstuart]

@mnin thanks for your progress on this - looks like it's taken some effort to address! 🙏

[MikeMcQuaid]

Can bump this to 4.0.1 if desired.

[mnin]

Thanks, I didn't want to change everything right away due to incompatibility with e.g. nokogiri and Ruby 3.1, among other things.

I was already on Ruby 4 with the PR.

I will implement it.