SRCH-5130: Change ruby version to 3.1.4.

[luisgmetzger]

Summary

• This PR addresses the change to the Ruby version ONLY in the .ruby-version file based on this ticket: https://cm-jira.usa.gov/browse/SRCH-5130

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[lorawoodford]

LGTM. As noted, we're prepping this now but a do-not-merge label will be applied as it must go out in the same deploy as all other changes (once those are complete).