Merge pull request #1301 from yuhuangbin/greenwich

upgrade nacos-client version to 1.2.1 based on SC.Greenwich

spring-cloud-alibaba-dependencies/pom.xml

@@ -21,7 +21,7 @@
         <sentinel.version>1.7.0</sentinel.version>
         <oss.version>3.1.0</oss.version>
         <seata.version>0.9.0</seata.version>
-        <nacos.client.version>1.2.0</nacos.client.version>
+        <nacos.client.version>1.2.1</nacos.client.version>
         <nacos.config.version>0.8.0</nacos.config.version>
         <acm.version>1.0.9</acm.version>
         <ans.version>1.0.1</ans.version>