Remove XMLType test skip for Oracle 12c+

The skip was added for issue rsim#114 investigation. Remove it to run
these tests on Oracle 23c.

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

Author: yahonda

spec/plsql/procedure_spec.rb

@@ -238,9 +238,6 @@
   describe "Function or procedure with XMLType parameters" do
     before(:all) do
       plsql.connect! CONNECTION_PARAMS
-      @oracle12c_or_higher = !! plsql.connection.select_all(
-        "select * from product_component_version where product like 'Oracle%' and to_number(substr(version,1,2)) >= 12")
-      skip "Skip until furtuer investigation for #114" if @oracle12c_or_higher
       plsql.execute <<-SQL
         CREATE OR REPLACE FUNCTION test_xmltype
           ( p_xml XMLTYPE )
@@ -261,8 +258,8 @@
     end
 
     after(:all) do
-      plsql.execute "DROP FUNCTION test_xmltype" unless @oracle12c_or_higher
-      plsql.execute "DROP PROCEDURE test_xmltype2" unless @oracle12c_or_higher
+      plsql.execute "DROP FUNCTION test_xmltype"
+      plsql.execute "DROP PROCEDURE test_xmltype2"
       plsql.logoff
     end