[CI] Update to Swift 6 CI #28

Job	Run time
Swift 6 Language Mode	0s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	59s
Soundness / API breakage check	53s
Integration test / Linux (5.9)	1m 34s
Soundness / License headers check	4s
Soundness / Unacceptable language check	3s
Integration test / Linux (5.10)	1m 27s
Integration test / Linux (6.0)	1m 38s
Soundness / Format check	31s
Integration test / Linux (nightly-6.0)	2m 4s
Soundness / Python lint check	4s
Soundness / Shell check	33s
Integration test / Linux (nightly-main)	29s
Soundness / YAML lint check	8s
Unit tests / Unit tests / Linux (5.9)	49s
Unit tests / Unit tests / Linux (5.10)	51s
Unit tests / Unit tests / Linux (6.0)	59s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 7s
Unit tests / Unit tests / Linux (nightly-main)	32s
	14m 48s

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