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

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Added

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

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docker/conf/modsecurity/crs/RESPONSE-999-EXCLUSION-RULES-AFTER-CRS.conf

@@ -36,3 +36,6 @@ SecRuleRemoveByID 930110
 # CR/LF + HTTP method name.
 SecRuleRemoveByID 921110
 
+# Ingres SQL exfil rule.
+SecRuleRemoveByID 951190
+