CI: fix encoding errors in iconv tests (php#22646)

Author: LamentXU123

ext/iconv/tests/eucjp2iso2022jp.phpt

@@ -29,8 +29,8 @@ function hexdump($str) {
     print "\n";
 }
 
-$str = str_repeat("���ܸ�ƥ����Ȥ� English text", 30);
-$str .= "���ܸ�";
+$str = str_repeat("日本語テキストと English text", 30);
+$str .= "日本語";
 
 echo hexdump(iconv("EUC-JP", "ISO-2022-JP", $str));
 ?>

ext/iconv/tests/iconv_mime_encode.phpt

@@ -33,7 +33,7 @@ $preference = array(
 for ($line_len= 0; $line_len < 80; ++$line_len) {
     print "-------- line length=$line_len\n";
     $preference["line-length"] = $line_len;
-    $result = iconv_mime_encode("From", "����ץ�ʸ���󥵥�ץ�ʸ�������ܸ�ƥ�����", $preference);
+    $result = iconv_mime_encode("From", "サンプル文字列サンプル文字列日本語テキスト", $preference);
     var_dump($result);
     if ($result !== false) {
                 $max = max(array_map("strlen", explode("\n", $result)));