Test failing with PHP 7.3

[remicollet]

From Fedora QA
https://apps.fedoraproject.org/koschei/package/php-true-punycode?collection=f30

There was 1 failure:
1) TrueBV\PunycodeTest::testEncodeUppercase with data set #19 ('άέήίΰαβγδεζηθικλμνξοπρσστυφχ.com', 'xn--hxacdefghijklmnopqrstuvw0...2a.com')
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'xn--hxacdefghijklmnopqrstuvw0caz0a1a2a.com'
+'xn--lsan50ceafgqijklmnopqrstuvwx2ca0afw3a4a.com'
/builddir/build/BUILD/php-punycode-a4d0c11a36dd7f4e7cd7096076cab6d3378a071e/tests/PunycodeTest.php:46
FAILURES!