fix: use try-with-resources in IssueCodeValueTest

Fixes PMD UseTryWithResources violation for ByteArrayInputStream.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: joaodinissf

com.avaloq.tools.ddk.check.core.test/src/com/avaloq/tools/ddk/check/core/generator/IssueCodeValueTest.java

@@ -92,11 +92,8 @@ public void testIssueCodeValue() throws Exception {
 
     // ACT
     List<JavaSource> compiledClassesList;
-    ByteArrayInputStream sourceStream = new ByteArrayInputStream(source.getBytes(StandardCharsets.UTF_8));
-    try {
+    try (ByteArrayInputStream sourceStream = new ByteArrayInputStream(source.getBytes(StandardCharsets.UTF_8))) {
       compiledClassesList = generateAndCompile(sourceStream);
-    } finally {
-      sourceStream.close();
     }
 
     // ASSERT