Use =~ operator for Ruby 2.4 compatibility in gemspec

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

ruby-plsql.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rspec", "~> 3.1"
   s.add_development_dependency "rspec_junit_formatter"
   s.add_development_dependency "simplecov"
-  if /java/.match?(RUBY_PLATFORM)
+  if RUBY_PLATFORM =~ /java/
     s.platform = Gem::Platform.new("java")
   else
     s.add_runtime_dependency "ruby-oci8", "~> 2.1"