USWDS-Site - Feature: Update ruby version

[mejiaj]

Is your feature request related to a problem? Please describe.

Ruby 3.1.2 has been released with some security fixes. We should update to get those security and any performance benefits.

Describe the solution you'd like

Check latest stable release on https://www.ruby-lang.org/en/downloads/releases/.

Describe alternatives you've considered

No response

Additional context

We should also double-check the circleci config

https://github.com/uswds/uswds-site/blob/2b92564fc0be666b3573bbee6ce869ee1207a3ab/.circleci/config.yml#L9

And update the .ruby-version. https://github.com/uswds/uswds-site/blob/2b92564fc0be666b3573bbee6ce869ee1207a3ab/.ruby-version#L1

Code of Conduct

• [X] I agree to follow this project's Code of Conduct.
• [X] I checked the current issues for duplicate feature requests.

[mejiaj]

@mahoneycm can we make this a part of our regular POAM process? We don't need to update every month, but we shouldn't be more than 3-5 versions behind.

Related to #2577.