upgrade dependency

pom.xml

@@ -24,11 +24,11 @@
 		<maven.compiler.target>1.8</maven.compiler.target>
 		<maven.test.skip>true</maven.test.skip>
 
-		<netty-all.version>4.1.54.Final</netty-all.version>
+		<netty-all.version>4.1.56.Final</netty-all.version>
 		<gson.version>2.8.6</gson.version>
 
-		<spring.version>5.3.1</spring.version>
-		<spring-boot.version>2.4.0</spring-boot.version>
+		<spring.version>5.3.2</spring.version>
+		<spring-boot.version>2.4.1</spring-boot.version>
 
 		<mybatis-spring-boot-starter.version>2.1.4</mybatis-spring-boot-starter.version>
 		<mysql-connector-java.version>8.0.22</mysql-connector-java.version>