[pom] More adjustments and drop sonar plugin back to version 4. (#1091)

pom.xml

@@ -359,7 +359,7 @@
         <plugin>
             <groupId>org.sonarsource.scanner.maven</groupId>
             <artifactId>sonar-maven-plugin</artifactId>
-            <version>5.0.0.4389</version>
+            <version>4.0.0.4121</version>
         </plugin>
       </plugins>
     </pluginManagement>

src/smoke-test/sonarqube-client

@@ -1,4 +1,4 @@
-FROM maven:3.6.3-jdk-8
+FROM maven:3.9.9-jdk-8
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   bash \

src/smoke-test/sonarqube-latest

@@ -1,5 +1,5 @@
-FROM sonarqube:8.2-community
-ENV SONAR_JAVA_VERSION=6.1.0.20866
+FROM sonarqube:9.9-community
+ENV SONAR_JAVA_VERSION=8.6.0.37351
 
 RUN (cd $SONARQUBE_HOME/extensions/plugins/ && curl -O https://repo.maven.apache.org/maven2/org/sonarsource/java/sonar-java-plugin/$SONAR_JAVA_VERSION/sonar-java-plugin-$SONAR_JAVA_VERSION.jar)
 COPY target/sonar-findbugs-plugin.jar $SONARQUBE_HOME/extensions/plugins/