Update dependency composer/installers to v1.12.0

This MR contains the following updates:

Package	Type	Update	Change
composer/installers (source)	require	minor	1.11.0 -> 1.12.0

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Release Notes

composer/installers

v1.12.0

Compare Source

Added

• Added installer for Pantheon Quicksilver modules/scripts #​495.

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docker/conf/php/7.3/fpm/pool.d/www.conf

 [www]
+user = ${PHP_FPM_USER}
 listen = /run/php/php7.3-fpm.sock
 
 pm = dynamic