remove unused maven plugin

pom.xml

@@ -10,14 +10,6 @@
     <version>3.0.0-alpha.1</version>
 
     <build>
-        <extensions>
-            <extension>
-                <groupId>kr.motd.maven</groupId>
-                <artifactId>os-maven-plugin</artifactId>
-                <version>1.7.1</version>
-            </extension>
-        </extensions>
-
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -100,24 +92,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.xolstice.maven.plugins</groupId>
-                <artifactId>protobuf-maven-plugin</artifactId>
-                <version>0.6.1</version>
-                <configuration>
-                    <protocArtifact>com.google.protobuf:protoc:3.25.3:exe:${os.detected.classifier}</protocArtifact>
-                    <pluginId>grpc-java</pluginId>
-                    <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.67.1:exe:${os.detected.classifier}</pluginArtifact>
-                </configuration>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>compile</goal>
-                            <goal>compile-custom</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
         </plugins>
     </build>