Update the nightly build version to Swift 6.1 #90

Job	Run time
Test with Docker / Windows (5.9 - windows-2022)	13m 18s
Test without Docker / Windows (5.9 - windows-2022)	5m 1s
Test with Docker / Linux (5.8 - jammy)	27s
Test without Docker / Linux (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test without Docker / Windows (6.0 - windows-2022)	4m 51s
Test with Docker / Windows (6.0 - windows-2022)	12m 36s
Test with Docker / Linux (5.9 - jammy)	27s
Test without Docker / Windows (nightly - windows-2022)	5m 43s
Test with Docker / Windows (nightly - windows-2019)	9m 17s
Test with Docker / Linux (5.10 - jammy)	27s
Test without Docker / Windows (nightly-6.0 - windows-2022)	2m 26s
Test with Docker / Windows (nightly-6.0 - windows-2019)	9m 35s
Test with Docker / Linux (6.0 - jammy)	33s
Test with Docker / Linux (nightly-main - jammy)	32s
Test with Docker / Linux (nightly-6.1 - jammy)	35s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	34s
Soundness / Format check	0s
Soundness / License headers check	3s
Soundness / Python lint check	3s
Soundness / Unacceptable language check	2s
Soundness / Shell check	31s
Soundness / YAML lint check	2s
	1h 7m 5s

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