Remove support for EOL Ruby 2.5

[tas50]

With the release of Ruby 3.1, Ruby 2.5 is now EOL. We should not be supporting an EOL release of Ruby.

Signed-off-by: Tim Smith tsmith@chef.io

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[chef-expeditor]

Hello tas50! Thanks for the pull request!

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[clintoncwolfe]

Thanks for this!