CI use 6.1 nightlies #74

Job	Run time
Soundness / Check generated code	1m 53s
Soundness / Swift license headers check	3s
Unit tests / Construct unit test matrix	5s
Cxx interop / Construct Cxx interop matrix	3s
Soundness / API breakage check	1m 57s
Soundness / Documentation check	1m 55s
Soundness / License headers check	4s
Soundness / Unacceptable language check	4s
Soundness / Broken symlinks check	3s
Soundness / Format check	32s
Soundness / Shell check	30s
Soundness / YAML lint check	2s
Soundness / Python lint check	8s
Cxx interop / Cxx interop / Linux (6.0)	1m 31s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 44s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 38s
Unit tests / Unit tests / Linux (6.0)	1m 31s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 39s
Unit tests / Unit tests / Linux (nightly-main)	1m 35s
	16m 57s

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