build(pom): upgrade modelVersion to 4.1.0 for Maven 4

Author: loong10k

pom.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0">
-    <modelVersion>4.0.0</modelVersion>
+<project xmlns="http://maven.apache.org/POM/4.1.0">
+    <modelVersion>4.1.0</modelVersion>
     <name>${project.groupId}:${project.artifactId}</name>
     <url>https://github.com/easy-4-java/${project.artifactId}</url>
     <groupId>io.github.easy4j</groupId>