Fix the dependency conflict issue

sentinel-transport/sentinel-transport-netty-http/pom.xml

@@ -36,11 +36,6 @@
             <artifactId>httpclient</artifactId>
             <version>4.5.3</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.httpcomponents</groupId>
-            <artifactId>httpcore</artifactId>
-            <version>4.4.5</version>
-        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
@@ -52,4 +47,4 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
-</project>
+</project>