refactor: use try-with-resources for FileOutputStream in saveCrate methods

Author: Pfeil

src/test/java/edu/kit/datamanager/ro_crate/writer/ZipStreamWriterTest.java

@@ -23,13 +23,17 @@ public void saveCrate(Crate crate, Path target) throws IOException {
 
   @Override
   public void saveCrateElnStyle(Crate crate, Path target) throws IOException {
-    new CrateWriter<>(new WriteZipStreamStrategy().usingElnStyle())
-            .save(crate, new FileOutputStream(target.toFile()));
+    try (FileOutputStream stream = new FileOutputStream(target.toFile())) {
+      new CrateWriter<>(new WriteZipStreamStrategy().usingElnStyle())
+              .save(crate, stream);
+    }
   }
 
   @Override
   public void saveCrateSubdirectoryStyle(RoCrate crate, Path target) throws IOException {
-    new CrateWriter<>(new WriteZipStreamStrategy().withRootSubdirectory())
-            .save(crate, new FileOutputStream(target.toFile()));
+    try (FileOutputStream stream = new FileOutputStream(target.toFile())) {
+      new CrateWriter<>(new WriteZipStreamStrategy().withRootSubdirectory())
+              .save(crate, stream);
+    }
   }
 }