chore: bump version to 2.1.1 and update release notes

src/main/resources/META-INF/plugin.xml

@@ -11,6 +11,12 @@
     ]]></description>
 
 <change-notes><![CDATA[
+      <h2>[2.1.1]</h2>
+        <ul>
+          <li>Update: Case-insensitive column type mapping in GUtils.java.</li>
+          <li>Update: Add "number" type mapping support for broader database compatibility.</li>
+          <li>Resource: Added sample Dataset.xml in DevResources for reference.</li>
+        </ul>
       <h2>[2.1.0]</h2>
         <ul>
           <li>Add: Generate Dataset XML feature to generate XML table definitions from database tables.</li>