Enable Swift 6.1 jobs in CI #33

Job	Run time
Cxx interop / Construct Cxx interop matrix	3s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 2s
Soundness / Documentation check	1m 6s
Soundness / Unacceptable language check	2s
Soundness / Broken symlinks check	4s
Soundness / License headers check	5s
Soundness / Format check	36s
Soundness / Python lint check	5s
Soundness / Shell check	31s
Soundness / YAML lint check	3s
Static SDK / Static SDK / Linux (latest-release Jammy)	1m 26s
Static SDK / Static SDK / Linux (main Jammy)	1m 41s
Unit tests / Unit tests / Linux (5.9)	50s
Unit tests / Unit tests / Linux (5.10)	48s
Unit tests / Unit tests / Linux (6.0)	1m 10s
Unit tests / Unit tests / Linux (6.1)	1m 0s
Unit tests / Unit tests / Linux (nightly-next)	1m 7s
Unit tests / Unit tests / Linux (nightly-main)	1m 15s
Cxx interop / Cxx interop / Linux (5.9)	52s
Cxx interop / Cxx interop / Linux (5.10)	47s
Cxx interop / Cxx interop / Linux (6.0)	56s
Cxx interop / Cxx interop / Linux (6.1)	55s
Cxx interop / Cxx interop / Linux (nightly-next)	1m 2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 8s
	18m 37s

Provide feedback