Update Grizzly dependencies and remove character encoding from response (#2887)

frameworks/Java/grizzly-bm/pom.xml

@@ -68,13 +68,13 @@
         <dependency>
             <groupId>org.glassfish.grizzly</groupId>
             <artifactId>grizzly-http-server</artifactId>
-            <version>2.3.28</version>
+            <version>2.3.31</version>
             <!--<version>3.0-SNAPSHOT</version>-->
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
     </dependencies>
     <!-- <repositories>

frameworks/Java/grizzly-bm/src/main/java/org/glassfish/grizzly/bm/JsonHttpHandler.java

@@ -15,7 +15,7 @@ public class JsonHttpHandler extends HttpHandler {
     private static final ObjectMapper MAPPER = new ObjectMapper();
     
     private static final ContentType CONTENT_TYPE =
-            ContentType.newContentType("application/json", "utf-8").prepare();
+            ContentType.newContentType("application/json").prepare();
     
     // Response message class.
     public static class HelloMessage {

frameworks/Java/grizzly-bm/src/main/java/org/glassfish/grizzly/bm/PlainText2HttpHandler.java

@@ -15,7 +15,7 @@ import org.glassfish.grizzly.utils.Charsets;
  */
 public class PlainText2HttpHandler extends HttpHandler {
     private static final ContentType CONTENT_TYPE =
-            ContentType.newContentType("text/plain", "utf-8").prepare();
+            ContentType.newContentType("text/plain").prepare();
     private static final byte[] HELLO_WORLD_BYTES = "Hello, World!".getBytes(Charsets.UTF8_CHARSET);
             
     @Override

frameworks/Java/grizzly-bm/src/main/java/org/glassfish/grizzly/bm/PlainTextHttpHandler.java

@@ -12,7 +12,7 @@ import org.glassfish.grizzly.http.util.Header;
  */
 public class PlainTextHttpHandler extends HttpHandler {
     private static final ContentType CONTENT_TYPE =
-            ContentType.newContentType("text/plain", "utf-8").prepare();
+            ContentType.newContentType("text/plain").prepare();
 
     @Override
     public void service(final Request request, final Response response)