Adopt the latest implementation for String#blank? from ActiveSupport and update benchmark result

[ken3ypa]

Diffs

• Adopted the latest implementation for String#blank? from ActiveSupport. (ref)
• Update the benchmark to reflect the latest implementation.

I noticed a minor diffs between the latest code in ActiveSupport and benchmarking code in this gem. After updating, the performance difference appears to be smaller; still this gem remains faster.

Thanks for making this gem. I really like this gem.

[mjankowski]

I noticed same thing and was going to do similar PR.

I see about a ~1x to ~3x diff locally in benchmark. Still noticeable, but smaller than the ~10+ year old versions of ruby/rails this first worked on.

Also noticed the ruby versions listed in the README are pretty out of date ... might be worth a once over on the ruby/rails versions supported to assist anyone arriving here with an "is this still relevant, given perf improvements in ruby/rails?" sort of question.

[n-rodriguez]

Hi there! Is this still relevant, given perf improvements in ruby/rails? 😝 (I'm running Rails 7.2 and Ruby 3.3.4)

Thank you!