fix maven plugin version

Signed-off-by: Ning Sun <sunng@protonmail.com>

Author: sunng87

formats/avro/pom.xml

@@ -59,6 +59,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.2.0</version>
                 <executions>
                     <execution>
                         <id>add-source</id>
@@ -74,15 +75,6 @@
                     </execution>
                 </executions>
             </plugin>
-
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                </configuration>
-            </plugin>
         </plugins>
     </build>