Support ruby3.3 Logger by properly initialize super class

Upcoming ruby3.3 will have enhanced Logger class:
ruby/ruby@194520f
which initializes newly added instance variables.
Without initializing such variables (in super class), now using
subclass of Logger will cause exception.

To avoid this, first call super, then execute additional subclass
initialization.

Fixes #73.

Signed-off-by: Mamoru TASAKA <[email protected]>

lib/mixlib/log/logger.rb

@@ -33,11 +33,7 @@ def trace?; @level <= TRACE; end
       # Create an instance.
       #
       def initialize(logdev)
-        @progname = nil
-        @level = DEBUG
-        @default_formatter = Formatter.new
-        @formatter = nil
-        @logdev = nil
+        super(nil)
         if logdev
           @logdev = LocklessLogDevice.new(logdev)
         end