Fix "new" Sonar issues

Reported as new due to touched source file.

Author: garyrussell

spring-integration-core/src/main/java/org/springframework/integration/config/xml/HeaderEnricherParserSupport.java

@@ -54,7 +54,7 @@
  */
 public abstract class HeaderEnricherParserSupport extends AbstractTransformerParser {
 
-	private final static Map<String, String[][]> cannedHeaderElementExpressions = new HashMap<>();
+	private static final Map<String, String[][]> cannedHeaderElementExpressions = new HashMap<>(); // NOSONAR lower case
 
 	private final Map<String, String> elementToNameMap = new HashMap<>();