chore(deps): bump dawidd6/action-download-artifact from 20 to 21 #129

Job	Run time
Setup old Shopware (5.6, 7.2, 5.7, none) / Setup Shopware 5.6	2m 30s
Setup old Shopware (5.3, 5.6, 5.7, 5.3.5-5.3.7) / Setup Shopware 5.3	2m 19s
Setup old Shopware (5.4, 5.6, 5.7, 5.4.6) / Setup Shopware 5.4	2m 47s
Setup old Shopware (5.2, 5.6, 5.7, 5.2.11-5.2.27) / Setup Shopware 5.2	1m 16s
Setup old Shopware (5.5, 7.1, 5.7, 5.5.0-5.5.10) / Setup Shopware 5.5	43s
	9m 35s

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