bump sortpom-maven-plugin to 4.0.0 (#241)

Author: jaredstehler

pom.xml

@@ -2127,7 +2127,7 @@
         <plugin>
           <groupId>com.github.ekryd.sortpom</groupId>
           <artifactId>sortpom-maven-plugin</artifactId>
-          <version>2.8.0</version>
+          <version>4.0.0</version>
           <configuration>
             <skip>${basepom.check.skip-pom-lint}</skip>
             <keepBlankLines>true</keepBlankLines>