relax test for zlib-ng

[remicollet]

Test failing with zlilb-ng 2.2

========DIFF========
--
       ["line"]=>
       int(%d)
     }
012- string(7) "Hello 6"
012+ string(6) "Hello "
========DONE========
FAIL GH-81475: Memory leak during stream filter failure [ext/standard/tests/filters/gh13264.phpt] 

[bukka]

Yeah this is fine. It's actually a bug that it returns a string which I plan to fix at some point (there are just few other items with higher priority but should be soon)

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Merged as ed1d51f