ostruct: warning: OpenStruct#define_singleton_method accesses caller method's state and should not be aliased

jruby 9.3.3.0 now shows the following warning. It did not show up in jruby 9.3.2.0.

jruby 9.3.3.0 (2.6.8) 2022-01-19 b26de1f5c5 OpenJDK 64-Bit Server VM 11.0.13+8-Ubuntu-0ubuntu1.20.04 on 11.0.13+8-Ubuntu-0ubuntu1.20.04 +jit [linux-x86_64]
uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/ostruct.rb:464: warning: OpenStruct#define_singleton_method accesses caller method's state and should not be aliased
uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/ostruct.rb:468: warning: OpenStruct#block_given? accesses caller method's state and should not be aliased