Bump the minimum required Ruby version to 3.2

Vitaly Slobodinrequested to merge
vs/bump-ruby-to-3-2 into master

Ruby 3.1 support ends on March 31, 2025 (https://endoflife.date/ruby), and most of our projects currently use Ruby 3.2. It makes sense to bump the minimum required Ruby version to 3.2. This is a breaking change.

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