fix: read pom file encoding other than UTF-8 (#10)

Author: algomaster99

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "src/test/resources/persistence/persistence"]
 	path = src/test/resources/persistence/persistence
 	url = [email protected]:jakartaee/persistence.git
+[submodule "src/test/resources/sling-maven/sling-maven"]
+	path = src/test/resources/sling-maven/sling-maven
+	url = [email protected]:apache/sling-slingfeature-maven-plugin.git

src/main/java/io/github/algomaster99/maven_module_graph/Utility.java

@@ -7,9 +7,9 @@
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.apache.maven.model.Model;
 import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
+import org.codehaus.plexus.util.ReaderFactory;
 import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
 
-import java.io.FileReader;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -49,7 +49,7 @@ public static MavenModule createMavenModuleGraph(Path projectRoot, MavenModule p
 
 	private static Model readPomModel(Path pomPath) throws IOException, XmlPullParserException {
 		MavenXpp3Reader reader = new MavenXpp3Reader();
-		return reader.read(new FileReader(pomPath.toFile()));
+		return reader.read(ReaderFactory.newXmlReader(pomPath.toFile()));
 	}
 
 	private static List<String> getAllModules(Model model) {

src/test/java/io/github/algomaster99/maven_module_graph/MavenModuleTest.java

@@ -64,6 +64,18 @@ void persistence_differentProjectRoot(@TempDir Path temp) throws XmlPullParserEx
 		);
 	}
 
+	@Test
+	void slingfeature_maven_plugin_differentPomEncoding(@TempDir Path temp) throws XmlPullParserException, IOException {
+		runTest(
+				"src/test/resources/sling-maven/sling-maven",
+				"src/test/resources/sling-maven/output.txt",
+				"src/test/resources/sling-maven/output.json",
+				temp.resolve("slingfeature-maven-plugin.txt"),
+				temp.resolve("slingfeature-maven-plugin.json"),
+				2, 2
+		);
+	}
+
 	private void runTest(
 			String modulePath,
 			String expectedTextPath,

src/test/resources/sling-maven/output.json

@@ -0,0 +1,6 @@
+{
+  "depth" : 0,
+  "groupId" : "org.apache.sling",
+  "artifactId" : "slingfeature-maven-plugin",
+  "version" : "1.6.8"
+}

src/test/resources/sling-maven/output.txt

@@ -0,0 +1 @@
+org.apache.sling:slingfeature-maven-plugin:1.6.8