change target version to java 11

Author: leafee98

pom.xml

@@ -12,8 +12,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>14</maven.compiler.source>
-    <maven.compiler.target>14</maven.compiler.target>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
   </properties>
 
   <dependencies>
@@ -37,6 +37,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.3.0</version>
       </plugin>
     </plugins>