fixups from errorprone

src/main/java/carpet/script/exception/ExitStatement.java

@@ -7,8 +7,7 @@ import org.jspecify.annotations.Nullable;
 /* Exception thrown to terminate execution mid expression (aka return statement) */
 public class ExitStatement extends StacklessRuntimeException
 {
-    @Nullable
-    public final Value retval;
+    public final @Nullable Value retval;
 
     public ExitStatement(@Nullable Value value)
     {