[ruby/irb] Update dependency, reline >= 0.2.8.pre.7

https://github.com/ruby/irb/commit/39593fb4d0

lib/irb/irb.gemspec

@@ -36,5 +36,5 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = Gem::Requirement.new(">= 2.5")
 
-  spec.add_dependency "reline", ">= 0.2.8.pre.6"
+  spec.add_dependency "reline", ">= 0.2.8.pre.7"
 end