[ruby/syntax_suggest] Raise minimum supported ruby version to 3.3

I want to start porting this to prism without the translation layer.

ruby/syntax_suggest@540d4840ab

Author: Earlopain

lib/syntax_suggest/syntax_suggest.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.description = 'When you get an "unexpected end" in your syntax this gem helps you find it'
   spec.homepage = "https://github.com/ruby/syntax_suggest.git"
   spec.license = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 3.0.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.3.0")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/ruby/syntax_suggest.git"