[ci] Make static classes 'static'

Author: hazendaz

src/main/java/org/apache/ibatis/builder/annotation/MapperAnnotationBuilder.java

@@ -657,7 +657,7 @@ public static Class<?> getMethodReturnType(String mapperFqn, String localStateme
     return null;
   }
 
-  private class AnnotationWrapper {
+  private static class AnnotationWrapper {
     private final Annotation annotation;
     private final String databaseId;
     private final SqlCommandType sqlCommandType;

src/main/java/org/apache/ibatis/executor/keygen/Jdbc3KeyGenerator.java

@@ -229,7 +229,7 @@ private static Collection<?> collectionize(Object param) {
     }
   }
 
-  private class KeyAssigner {
+  private static class KeyAssigner {
     private final Configuration configuration;
     private final ResultSetMetaData rsmd;
     private final TypeHandlerRegistry typeHandlerRegistry;

src/main/java/org/apache/ibatis/scripting/xmltags/XMLScriptBuilder.java

@@ -104,7 +104,7 @@ private interface NodeHandler {
     void handleNode(XNode nodeToHandle, List<SqlNode> targetContents);
   }
 
-  private class BindHandler implements NodeHandler {
+  private static class BindHandler implements NodeHandler {
     public BindHandler() {
       // Prevent Synthetic Access
     }