Collect a record's members with Stream.toList()

Collectors.toUnmodifiableList() was there only because the list was
declared List<Tree>, and Stream.toList() on getMembers(), a
List<? extends Tree>, gives a list of the wildcard's capture.
addBodyDeclarations takes a List<? extends Tree>, so the variable is a
var and the stream ends in toList(), as CLAUDE.md asks.

Author: abashev

open-java-format/src/main/java/com/palantir/javaformat/java/java14/Java14InputAstVisitor.java

@@ -43,7 +43,6 @@
 import java.lang.reflect.Method;
 import java.util.List;
 import java.util.Optional;
-import java.util.stream.Collectors;
 import javax.lang.model.element.Name;
 import org.jspecify.annotations.Nullable;
 
@@ -225,9 +224,9 @@ public void visitRecordDeclaration(ClassTree node) {
         if (node.getMembers() == null) {
             token(";");
         } else {
-            List<Tree> members = node.getMembers().stream()
+            var members = node.getMembers().stream()
                     .filter(t -> (TreeInfo.flags((JCTree) t) & Flags.GENERATED_MEMBER) == 0)
-                    .collect(Collectors.toUnmodifiableList());
+                    .toList();
             addBodyDeclarations(members, BracesOrNot.YES, FirstDeclarationsOrNot.YES);
         }
         dropEmptyDeclarations();