Update dependency phpunit/phpunit to v13 #143

Job	Run time
Create Release / Set Milestone / Supported Versions Matrix	6s
Create Release / Diff / Composer Diff / Comment composer.lock diff	10s
Create Release / Craft Release	0s
Create Release / Required Labels	0s
Create Release / Diff / Terraform Diff	0s
Create Release / Diff / Helm Diff	0s
Create Release / Set Milestone / Supported Threading Matrix / Supported Threading Matrix	4s
Create Release / Set Milestone / Figure out what the version should be	2m 36s
Create Release / Set Milestone / Set Milestone / Set Milestone	15s
	3m 11s

Provide feedback