Ruby

[ruby/irb] Update regarding NO_COLOR value

https://no-color.org has been updated (jcs/no_color#83):

Command-line software which adds ANSI color to its output by default
should check for a NO_COLOR environment variable that, when present
and not an empty string (regardless of its value), prevents the
addition of ANSI color.

https://github.com/ruby/irb/commit/46e0f7e370

Co-authored-by: Stan Lo [email protected]