CI use 6.1 nightlies #73

Job	Run time
Soundness / Swift license headers check	4s
Soundness / Check generated code	1m 52s
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	2s
Soundness / Documentation check	2m 1s
Soundness / API breakage check	2m 6s
Soundness / Broken symlinks check	2s
Soundness / Format check	35s
Soundness / License headers check	3s
Soundness / Python lint check	5s
Soundness / Shell check	31s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	4s
Cxx interop / Cxx interop / Linux (6.0)	1m 34s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 44s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 42s
Unit tests / Unit tests / Linux (6.0)	1m 32s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 38s
Unit tests / Unit tests / Linux (nightly-main)	1m 36s
	17m 15s

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