Add the Logger modifier "static" in pr #1347 (#1353)

* add the Logger modifier "static" in pr 

apm-collector/apm-collector-component/client-component/src/main/java/org/apache/skywalking/apm/collector/client/shardingjdbc/ShardingjdbcClient.java

@@ -43,7 +43,7 @@ import io.shardingjdbc.core.api.config.ShardingRuleConfiguration;
  */
 public class ShardingjdbcClient implements Client {
 
-    private final Logger logger = LoggerFactory.getLogger(ShardingjdbcClient.class);
+    private static final Logger logger = LoggerFactory.getLogger(ShardingjdbcClient.class);
     
     private Map<String, ShardingjdbcClientConfig> shardingjdbcClientConfig;
     

apm-collector/apm-collector-storage/collector-storage-shardingjdbc-provider/src/main/java/org/apache/skywalking/apm/collector/storage/shardingjdbc/base/define/ShardingjdbcStorageInstaller.java

@@ -36,7 +36,7 @@ import org.slf4j.LoggerFactory;
  */
 public class ShardingjdbcStorageInstaller extends StorageInstaller {
 
-    private final Logger logger = LoggerFactory.getLogger(ShardingjdbcStorageInstaller.class);
+    private static final Logger logger = LoggerFactory.getLogger(ShardingjdbcStorageInstaller.class);
 
     public ShardingjdbcStorageInstaller(boolean isHighPerformanceMode) {
         super(isHighPerformanceMode);