Allow Ruby 3.3

It should work I guess

Author: mame

typeprof.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   EOD
   spec.homepage      = "https://github.com/ruby/typeprof"
   spec.license       = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 3.4")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.3")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/ruby/typeprof"