Merge pull request #965 from Automattic/auto-update/wordpress-versions #971

Job	Run time
Prepare build matrix	9s
Build Docker image (ref: 6.7.1, tag: 6.7)	2m 18s
Build Docker image (ref: 6.6.2, tag: 6.6)	1m 38s
Build Docker image (ref: 6.5.5, tag: 6.5)	2m 9s
Build Docker image (ref: 6.4.5, tag: 6.4)	1m 43s
Build Docker image (ref: 6.3.5, tag: 6.3)	1m 12s
Build Docker image (ref: 6.2.6, tag: 6.2)	1m 26s
Build Docker image (ref: 6.1.7, tag: 6.1)	2m 11s
Build Docker image (ref: 6.0.9, tag: 6.0)	1m 19s
Build Docker image (ref: HEAD, tag: trunk)	2m 18s
	16m 23s

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