Downgrade checkout-action #311

Job	Run time
Lint Code Base / yaml-linter	5s
Lint Code Base / style-linter	16s
Lint Code Base / json-linter	27s
Lint Code Base / ecmascript-linter	20s
Build assets	25s
Determine next version	9s
Commit changes to assets	10s
Cleanup artifacts	6s
	1m 58s

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