Bump composer/composer from 2.8.12 to 2.9.3 #178

Job	Run time
Create Release / Required Labels / Required Labels	3s
Create Release / Set Milestone / Supported Versions Matrix	5s
Create Release / Diff	0s
Create Release / Craft Release	0s
Create Release / Set Milestone / Supported Threading Matrix / Supported Threading Matrix	2s
Create Release / Set Milestone / Figure out what the version should be	45s
Create Release / Set Milestone / Set Milestone / Set Milestone	11s
	1m 6s

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