update Maven wrapper to version 3.9.13 and adjust wrapper URL

Author: while1618

backend/spring-boot/.mvn/wrapper/maven-wrapper.jar

@@ -1,2 +1,2 @@
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
-wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.13/apache-maven-3.9.13-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.5.4/maven-wrapper-3.5.4.jar