[Sync 2022.x to 2021.x]: deleted invalid contents

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/pom.xml

@@ -45,23 +45,6 @@
             <groupId>com.alibaba.csp</groupId>
             <artifactId>sentinel-datasource-nacos</artifactId>
         </dependency>
-        <!--<dependency>-->
-        <!--<groupId>com.alibaba.csp</groupId>-->
-        <!--<artifactId>sentinel-datasource-zookeeper</artifactId>-->
-        <!--</dependency>-->
-        <!--<dependency>-->
-        <!--<groupId>com.alibaba.csp</groupId>-->
-        <!--<artifactId>sentinel-datasource-apollo</artifactId>-->
-        <!--</dependency>-->
-        <!--<dependency>-->
-        <!--<groupId>com.alibaba.csp</groupId>-->
-        <!--<artifactId>sentinel-datasource-redis</artifactId>-->
-        <!--</dependency>-->
-        <!-- define in spring-boot-autoconfigure module -->
-        <!--<dependency>-->
-        <!--<groupId>com.fasterxml.jackson.dataformat</groupId>-->
-        <!--<artifactId>jackson-dataformat-xml</artifactId>-->
-        <!--</dependency>-->
     </dependencies>
 
     <build>