Update version to 1.3.1 on document

(cherry picked from commit 75bcc89)

Author: kazuki43zoo

mybatis-spring-boot-autoconfigure/src/site/xdoc/index.xml.vm

@@ -56,7 +56,7 @@
           </thead>
           <tbody>
             <tr>
-              <td><b>1.3.x (1.3.0)</b></td>
+              <td><b>1.3.x (1.3.1)</b></td>
               <td>1.3 or higher</td>
               <td>1.5 or higher</td>
             </tr>

mybatis-spring-boot-test-autoconfigure/src/site/xdoc/index.xml.vm

@@ -58,7 +58,7 @@
           </thead>
           <tbody>
             <tr>
-              <td><b>1.3.x (1.3.0)</b></td>
+              <td><b>1.3.x (1.3.1)</b></td>
               <td>1.5 or higher</td>
             </tr>
             <tr>