ruby/spec no longer supports 3.2

Merged: https://github.com/ruby/ruby/pull/15994

.github/workflows/spec_guards.yml

@@ -39,7 +39,6 @@ jobs:
         # Specs from ruby/spec should still run on all supported Ruby versions.
         # This also ensures the needed ruby_version_is guards are there, see spec/README.md.
         ruby:
-          - ruby-3.2
           - ruby-3.3
           - ruby-3.4
           - ruby-4.0