[ruby/psych] Bump snakeyaml from 1.28 to 1.31

Resolves CVE-2022-25857, among other fixes.

https://github.com/ruby/psych/commit/918cd25d37

ext/psych/lib/psych/versions.rb

@@ -5,6 +5,6 @@ module Psych
   VERSION = '5.0.0.dev'
 
   if RUBY_ENGINE == 'jruby'
-    DEFAULT_SNAKEYAML_VERSION = '1.28'.freeze
+    DEFAULT_SNAKEYAML_VERSION = '1.31'.freeze
   end
 end