Fix formatter regression from

chef#74 fixed an issue
with Ruby 3.3's version of Logger. However, it dropped
`Mixlib::Log::Formatter` from the formatter, so all messages
now output as a Hash instead of a string.

lib/mixlib/log/logger.rb

@@ -33,7 +33,7 @@ def trace?; @level <= TRACE; end
       # Create an instance.
       #
       def initialize(logdev)
-        super(nil)
+        super(nil, formatter: ::Mixlib::Log::Formatter.new)
         if logdev
           @logdev = LocklessLogDevice.new(logdev)
         end