Update composer Docker tag to v2.5.5

This MR contains the following updates:

Package	Type	Update	Change
composer	final	minor	2.2.9 -> 2.5.5
composer	stage	minor	2.2.9 -> 2.5.5

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docker/conf/apache2/conf-available/modsecurity-custom.conf

@@ -6,5 +6,7 @@
                   SecRuleEngine Off
         </Location>
 
+	ErrorLog "|/usr/local/bin/modsec_logger"
+
 </IfModule>
 </IfModule>