fix test for 8.6.0beta2 - #420

========DIFF========
001- bool(true)
002- read
003- wrote: 14021103666f6f06011104746573741106666f6f626172
001+ Warning: Class S implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0 in /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 6
002+ 
003+ Warning: Class S implementing SessionHandlerInterface is missing the validateId() method which will be required in PHP 9.0 in /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 6
004+ 
005+ Warning: ini_set(): Session ini settings cannot be changed after headers have already been sent (sent from /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 6) in /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 45
006+ 
007+ Warning: session_start(): Session cannot be started after headers have already been sent (sent from /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 6) in /work/GIT/pecl-and-ext/igbinary/tests/igbinary_047.php on line 53
008+ bool(false)
========DONE========