Set the default Ruby release to 2.7.1

It's time to consume 2.7.1 everywhere

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

Author: tas50

config/software/ruby.rb

@@ -25,7 +25,7 @@
 # the default versions should always be the latest release of ruby
 # if you consume this definition it is your responsibility to pin
 # to the desired version of ruby. don't count on this not changing.
-default_version "2.6.6"
+default_version "2.7.1"
 
 dependency "zlib"
 dependency "openssl"