pom: remove redundant plugin declarations

pom.xml

@@ -145,6 +145,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.2.0</version>
                 <executions>
                     <execution>
                         <id>regex-property</id>
@@ -159,25 +160,6 @@
                             <failIfNoMatch>false</failIfNoMatch>
                         </configuration>
                     </execution>
-                </executions>
-            </plugin>
-
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
-                <configuration>
-                    <encoding>UTF-8</encoding>
-                    <fork>true</fork>
-                    <release>${java.release}</release>
-                </configuration>
-            </plugin>
-
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>build-helper-maven-plugin</artifactId>
-                <version>3.2.0</version>
-                <executions>
                     <execution>
                         <id>test</id>
                         <phase>generate-sources</phase>
@@ -193,6 +175,18 @@
                 </executions>
             </plugin>
 
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <encoding>UTF-8</encoding>
+                    <fork>true</fork>
+                    <release>${java.version}</release>
+                    <showDeprecation>true</showDeprecation>
+                </configuration>
+            </plugin>
+
             <!-- compile proto file into java files. -->
             <plugin>
                 <groupId>org.xolstice.maven.plugins</groupId>
@@ -216,18 +210,6 @@
                 </executions>
             </plugin>
 
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
-                <configuration>
-                    <showDeprecation>true</showDeprecation>
-                    <release>${java.version}</release>
-                    <!-- without forking compilation happens in the
-                    same process, so no arguments are applied -->
-                    <fork>true</fork>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>