Removing external file dependency from license formatter

Signed-off-by: Marvin Froeder <velo.br@gmail.com>

pom.xml

@@ -1,17 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-    Copyright 2012-2024 The Feign Authors
+    Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
 
-    Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
-    in compliance with the License. You may obtain a copy of the License at
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
 
-    http://www.apache.org/licenses/LICENSE-2.0
+        http://www.apache.org/licenses/LICENSE-2.0
 
-    Unless required by applicable law or agreed to in writing, software distributed under the License
-    is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
-    or implied. See the License for the specific language governing permissions and limitations under
-    the License.
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
 
 -->
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
@@ -652,10 +654,14 @@
         <artifactId>license-maven-plugin</artifactId>
         <version>${license-maven-plugin.version}</version>
         <configuration>
+          <properties>
+            <owner>The Feign Authors</owner>
+            <email>feign@commonhaus.dev</email>
+          </properties>
           <licenseSets>
             <licenseSet>
-              <!-- session.executionRootDirectory resolves properly even with nested modules -->
-              <header>${main.basedir}/src/etc/header.txt</header>
+              <header>com/mycila/maven/plugin/license/templates/APACHE-2.txt</header>
+
               <excludes>
                 <exclude>.travis.yml</exclude>
                 <exclude>.editorconfig</exclude>