Bump composer/composer from 2.8.11 to 2.9.3 #66

Job	Run time
Create Release / Required Labels / Required Labels	3s
Create Release / Set Milestone / Supported Versions Matrix	5s
Create Release / Diff / Composer Diff / Comment composer.lock diff	12s
Create Release / Craft Release	-1s
Create Release / Diff / Helm Diff	0s
Create Release / Diff / Terraform Diff	0s
Create Release / Set Milestone / Supported Threading Matrix / Supported Threading Matrix	4s
Create Release / Set Milestone / Figure out what the version should be	25s
Create Release / Set Milestone / Set Milestone / Set Milestone	47s
	1m 35s

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