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/chaperone.d/clean-sessions.service

-clean_sessions.service: {
-    type: cron,
-    interval: "10,40 * * * *",
-    command: "/usr/bin/find /var/lib/php/sessions -mindepth 1 -type f -mtime +1 -delete",
-}