[CI] Update to Swift 6 CI #133

Job	Run time
Compatibility test	4m 57s
Swift 6 Language Mode	0s
Integration test / Linux (5.9)	1m 38s
Integration test / Linux (5.10)	1m 32s
Integration test / Linux (6.0)	1m 41s
Integration test / Linux (nightly-6.0)	2m 6s
Integration test / Linux (nightly-main)	32s
Example packages / Linux (5.9)	5m 13s
Soundness / API breakage check	2m 12s
Example packages / Linux (5.10)	5m 13s
Example packages / Linux (6.0)	5m 15s
Soundness / Broken symlinks check	2s
Example packages / Linux (nightly-6.0)	5m 12s
Soundness / Documentation check	1m 31s
Example packages / Linux (nightly-main)	30s
Soundness / Unacceptable language check	2s
Soundness / License headers check	5s
Soundness / Format check	34s
Soundness / Python lint check	4s
Soundness / Shell check	32s
Soundness / YAML lint check	0s
Unit tests / Unit tests / Linux (5.9)	1m 38s
Unit tests / Unit tests / Linux (5.10)	1m 36s
Unit tests / Unit tests / Linux (6.0)	1m 42s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 4s
Unit tests / Unit tests / Linux (nightly-main)	28s
	46m 19s

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