fix minor build warnings (#3968)

* remove duplicated dependency

* remove duplicated jar plugin

Author: SylvainJuge

apm-agent-attach/pom.xml

@@ -59,9 +59,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <artifactId>maven-jar-plugin</artifactId>
-            </plugin>
             <plugin>
                 <artifactId>maven-dependency-plugin</artifactId>
                 <dependencies>

apm-agent-core/pom.xml

@@ -58,11 +58,6 @@
             <artifactId>jctools-core</artifactId>
             <version>4.0.5</version>
         </dependency>
-        <dependency>
-            <groupId>com.googlecode.concurrentlinkedhashmap</groupId>
-            <artifactId>concurrentlinkedhashmap-lru</artifactId>
-            <version>1.4.2</version>
-        </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>