Close zip file

Issue gh-9467

buildSrc/src/test/java/io/spring/gradle/convention/DocsPluginITest.java

@@ -35,12 +35,14 @@ public class DocsPluginITest {
 		assertThat(result.task(":docs").getOutcome()).isEqualTo(SUCCESS);
 		assertThat(result.task(":docsZip").getOutcome()).isEqualTo(SUCCESS);
 		File zip = new File(testKit.getRootDir(), "build/distributions/simple-1.0.0.BUILD-SNAPSHOT-docs.zip");
-		List<? extends ZipEntry> entries = Collections.list(new ZipFile(zip).entries());
+		try (ZipFile file = new ZipFile(zip)) {
+			List<? extends ZipEntry> entries = Collections.list(file.entries());
 			assertThat(entries)
 					.extracting(ZipEntry::getName)
 					.contains("docs/reference/html5/index.html")
 					.contains("docs/reference/pdf/simple-reference.pdf");
 		}
+	}
 
 	@Test
 	public void asciidocCopiesImages() throws Exception {