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What are you trying to accomplish with this PR?
End our support of Ruby 2.3 since Ruby 2.3 is no longer supported.
How is this accomplished?
Bump some things.
What could go wrong?
There isn't anything that requires 2.4, though there appears to be some gem version fun. We could since the burden to support 2.3 is trivial today we could keep supporting. However, I'm of the belief that we shouldn't tie ourselves to unsupported versions.