[rails] Upgrade ruby to 3.3-rc for rails-mysql (#8461)

This makes sure both version run the same ruby version.

frameworks/Ruby/rails/rails-mysql.dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.2
+FROM ruby:3.3-rc
 
 RUN apt-get update -yqq && apt-get install -yqq --no-install-recommends redis-server