ext/zip: declare true as the return type of zip_entry_close() (#23395)

The function has two exits: RETURN_THROWS for a bad parameter or a
stale resource, and an unconditional RETURN_TRUE after closing the
entry. Nothing returns false.

Author: lacatoire

ext/zip/php_zip.stub.php

@@ -32,7 +32,7 @@ function zip_entry_open($zip_dp, $zip_entry, string $mode = "rb"): bool {}
  * @param resource $zip_entry
  */
 #[\Deprecated(since: '8.0')]
-function zip_entry_close($zip_entry): bool {}
+function zip_entry_close($zip_entry): true {}
 
 /**
  * @param resource $zip_entry