CI use 6.1 nightlies #212

Job	Run time
Construct Examples matrix	3s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	4s
Soundness / Check generated code	1m 15s
Soundness / Swift license headers check	7s
Unit tests / Construct unit test matrix	4s
Soundness / API breakage check	1m 8s
Soundness / Documentation check	1m 22s
Soundness / Broken symlinks check	3s
Soundness / Format check	34s
Soundness / License headers check	5s
Soundness / Python lint check	9s
Soundness / Shell check	31s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	2s
Examples / Linux (6.0)	11m 12s
Examples / Linux (nightly-6.1)	3m 38s
Examples / Linux (nightly-main)	3m 25s
Benchmarks / Benchmarks / Linux (6.0)	2m 23s
Benchmarks / Benchmarks / Linux (nightly-6.1)	2m 53s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 47s
Cxx interop / Cxx interop / Linux (6.0)	54s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 18s
Unit tests / Unit tests / Linux (6.0)	1m 24s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 34s
Unit tests / Unit tests / Linux (nightly-main)	1m 35s
	39m 36s

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