clean up pom and upgrade xstream version

pom.xml

@@ -74,7 +74,6 @@
 		<nacos-discovery-api.version>1.4.0</nacos-discovery-api.version>
 		<common-lang3.version>3.12.0</common-lang3.version>
 		<mysql-connector-java.version>8.0.29</mysql-connector-java.version>
-		<cat.client.version>3.1.0</cat.client.version>
 		<!-- Plugins Version -->
 		<maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
 		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
@@ -105,11 +104,6 @@
 				<artifactId>apollo-core</artifactId>
 				<version>${apollo-java.version}</version>
 			</dependency>
-			<dependency>
-				<groupId>com.ctrip.framework.apollo</groupId>
-				<artifactId>apollo-client</artifactId>
-				<version>${apollo-java.version}</version>
-			</dependency>
 			<dependency>
 				<groupId>com.ctrip.framework.apollo</groupId>
 				<artifactId>apollo-common</artifactId>
@@ -176,16 +170,11 @@
 				<artifactId>commons-lang3</artifactId>
 				<version>${common-lang3.version}</version>
 			</dependency>
-			<dependency>
-				<groupId>com.dianping.cat</groupId>
-				<artifactId>cat-client</artifactId>
-				<version>${cat.client.version}</version>
-			</dependency>
-			<!-- to fix CVE-2020-26217 -->
+			<!-- to fix CVE-2022-41966 -->
 			<dependency>
 				<groupId>com.thoughtworks.xstream</groupId>
 				<artifactId>xstream</artifactId>
-				<version>1.4.19</version>
+				<version>1.4.20</version>
 			</dependency>
 			<!--for test -->
 			<dependency>