Fix broken CI due to rake-compiler error on Ruby < 2.6 #1007
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The recently released rake-compiler 1.2.4 breaks compatibility with Ruby 2.5 and below. It is causing concurrent-ruby CI jobs to fail with errors like this:
The rake-compiler regression has been reported here:
rake-compiler/rake-compiler#224
As a workaround, this PR updates the ruby-concurrent Gemfile to avoid rake-compiler 1.2.4. This should fix the broken CI jobs.