Add FalseClass to SAFE_MARSHAL_CLASSES

* It is needed by `jt test bundle` when CRuby 3.2 is running gem server.
  With CRuby 3.1 this error did not happen.

lib/mri/bundler.rb

@@ -39,7 +39,8 @@ module Bundler
   environment_preserver.replace_with_backup
   SUDO_MUTEX = Thread::Mutex.new
 
-  SAFE_MARSHAL_CLASSES = [Symbol, TrueClass, String, Array, Hash, Gem::Version, Gem::Specification].freeze
+  # TruffleRuby: FalseClass added because it is necessary for `jt test bundle`, and also done upstream since https://github.com/rubygems/rubygems/pull/6655
+  SAFE_MARSHAL_CLASSES = [Symbol, TrueClass, FalseClass, String, Array, Hash, Gem::Version, Gem::Specification].freeze
   SAFE_MARSHAL_ERROR = "Unexpected class %s present in marshaled data. Only %s are allowed."
   SAFE_MARSHAL_PROC = proc do |object|
     object.tap do