Use Gem::Version for ruby-oci8 version comparison

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

Author: yahonda

lib/plsql/oci_connection.rb

@@ -15,10 +15,9 @@
 end
 
 # check ruby-oci8 version
-required_oci8_version = [2, 1, 0]
-oci8_version_ints = OCI8::VERSION.scan(/\d+/).map { |s| s.to_i }
-if (oci8_version_ints <=> required_oci8_version) < 0
-  raise LoadError, "ERROR: ruby-oci8 version #{OCI8::VERSION} is too old. Please install ruby-oci8 version #{required_oci8_version.join('.')} or later."
+required_oci8_version = "2.1.0"
+if Gem::Version.new(OCI8::VERSION) < Gem::Version.new(required_oci8_version)
+  raise LoadError, "ERROR: ruby-oci8 version #{OCI8::VERSION} is too old. Please install ruby-oci8 version #{required_oci8_version} or later."
 end
 
 module PLSQL