utils: replace bright green with ANSI bold+green.
utils: replace bright green with ANSI bold+green.

There are two ways of outputting bright ANSI colors to the terminal - the ANSI codes 30-37 plus a bold code (most terminals render bold text with brighter colors, by convention), or the widely supported aixterm codes 90-97.

Although the aixterm codes are more precise (disambiguating bold font from bright color), the ANSI bold+green enables compatibility with the popular [Solarized](https://github.com/altercation/solarized) color theme, which reassigns the "bright green" codepoint to a shade of gray.

Closes Homebrew/homebrew#27125.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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