Enable Swift 6.1 jobs in CI #107

Job	Run time
Cxx interop / Construct Cxx interop matrix	3s
Unit tests / Construct unit test matrix	5s
Soundness / API breakage check	4m 18s
Soundness / Documentation check	2m 53s
Soundness / Unacceptable language check	3s
Soundness / License headers check	6s
Soundness / Broken symlinks check	3s
Soundness / Format check	38s
Soundness / Shell check	31s
Soundness / YAML lint check	3s
Soundness / Python lint check	7s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 19s
Static SDK / Static SDK / Linux (main Jammy)	4m 3s
Cxx interop / Cxx interop / Linux (5.9)	2m 26s
Cxx interop / Cxx interop / Linux (5.10)	2m 24s
Cxx interop / Cxx interop / Linux (6.0)	2m 45s
Cxx interop / Cxx interop / Linux (6.1)	2m 38s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 20s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 21s
Unit tests / Unit tests / Linux (5.9)	4m 35s
Unit tests / Unit tests / Linux (5.10)	4m 36s
Unit tests / Unit tests / Linux (6.0)	5m 2s
Unit tests / Unit tests / Linux (6.1)	4m 54s
Unit tests / Unit tests / Linux (nightly-next)	5m 39s
Unit tests / Unit tests / Linux (nightly-main)	5m 37s
	1h 3m 29s

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