Update ramsey/composer-install action to v3 #320

Job	Run time
Release Management / Required Labels / Required Labels	6s
Release Management / Set Milestone / Supported Versions Matrix	6s
Release Management / Craft Release	-1s
Release Management / Diff / Terraform Diff	-1s
Release Management / Diff / Composer Diff / Comment composer.lock diff	11s
Release Management / Diff / Helm Diff	-1s
Release Management / Set Milestone / Supported Threading Matrix / Supported Threading Matrix	5s
Release Management / Set Milestone / Figure out what the version should be	37s
Release Management / Set Milestone / Set Milestone / Set Milestone	17s
	1m 19s

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