add PHP 5.5.26 and drop 5.5.23 [#98547428]
add PHP 5.5.26 and drop 5.5.23 [#98547428]

Signed-off-by: Amin Jams <2a8a1939169aaaf7d731bc6f08ed1c227144135f@gmail.com>

thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack