Apply mb_strtoupper consistently to TLD for filename

Co-authored-by: henriquemoody <154023+henriquemoody@users.noreply.github.com>

Author: Copilot

src-dev/Commands/UpdateDomainSuffixesCommand.php

@@ -109,7 +109,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
             // Convert TLD to Punycode for filename if it contains non-ASCII characters
             $punycoded = idn_to_ascii($tld, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46);
-            $tldForFile = $punycoded !== false ? mb_strtoupper($punycoded) : $tld;
+            $tldForFile = mb_strtoupper($punycoded !== false ? $punycoded : $tld);
 
             $this->dataSaver->save(
                 $suffixList,