fix: add test and new dep for missing xalan serializer

[bjagg]

No description provided.

[Copilot]

Pull Request Overview

This PR ensures the Xalan serializer is on the classpath by adding its Maven dependency and verifies it via a new unit test.

• Introduce xalan.version property and manage xalan/serializer versions centrally.
• Add serializer dependency alongside xalan in both dependencyManagement and runtime dependencies.
• Create XalanSerializerTest to assert that OutputPropertiesFactory loads default XML properties.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/test/java/org/jasig/portlet/newsreader/XalanSerializerTest.java	New JUnit test to verify Xalan’s OutputPropertiesFactory loads.
pom.xml	Defines xalan.version and adds xalan:serializer to dependencies.

Comments suppressed due to low confidence (2)

src/test/java/org/jasig/portlet/newsreader/XalanSerializerTest.java:32

• The test only checks that props is not null; consider adding assertions for specific expected keys or values (e.g., indent settings) to ensure the serializer behavior is correct.

Properties props = OutputPropertiesFactory.getDefaultMethodProperties("xml");

src/test/java/org/jasig/portlet/newsreader/XalanSerializerTest.java:28

• [nitpick] The class is named XalanSerializerTest but the test targets OutputPropertiesFactory; consider renaming to OutputPropertiesFactoryTest or broadening the test to explicitly cover serialization behavior.

public class XalanSerializerTest {

[Naenyn]

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