Fix PMD

Author: MatKuhr

cloudplatform/connectivity-destination-service/src/main/java/com/sap/cloud/sdk/cloudplatform/connectivity/DestinationServiceAdapter.java

@@ -199,7 +199,7 @@ private HttpUriRequest prepareRequest( final String servicePath, final Destinati
         if( strategy.fragment() != null ) {
             request.addHeader("x-fragment-name", strategy.fragment());
         }
-        for( Header h : strategy.additionalHeaders() ) {
+        for( final Header h : strategy.additionalHeaders() ) {
             request.addHeader(h.getName(), h.getValue());
         }