Use bundler for installing dependencies, fix ruby-head issues #3
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For some reason CI started failing on ruby-head because
power-assert
is not installed. It's bundled, not sure what's going on here and it worked a few days ago. Anyways, bundler makes the workflow nicer overall.I also added frozen string literals to all files. With Ruby 3.4 chilled strings being merged there were a truckload of warnings being emitted, plus a few errors that will be fixed in the future by something along the lines of ruby/stringio#93
The frozen string literals commit can probably be upstreamed relativly painlessly. I would do it myself, but honestly, no idea how to even do that.