[ruby/grape] Upgrade to Ruby 4.0-rc (#10387)

frameworks/Ruby/grape/grape-iodine.dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.5-rc
+FROM ruby:4.0-rc
 
 ENV RUBY_YJIT_ENABLE=1
 

frameworks/Ruby/grape/grape.dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.5-rc
+FROM ruby:4.0-rc
 
 ENV RUBY_YJIT_ENABLE=1