Specify SwiftSyntax601 in more places. #138

Job	Run time
Validate generated code	2m 48s
Run tests using swift-syntax-dev-utils (Windows)	46m 42s
Run tests using swift-syntax-dev-utils (Linux)	22m 57s
Test / Linux (5.9 - jammy)	3m 52s
Test / Windows (5.9 - windows-2022)	17m 50s
Test / Windows (6.0 - windows-2022)	18m 20s
Test / Windows (nightly - windows-2019)	16m 41s
Test / Linux (5.10 - jammy)	3m 51s
Test / Windows (nightly-6.1 - windows-2019)	18m 3s
Test / Linux (6.0 - jammy)	4m 2s
Test / Linux (nightly-main - jammy)	4m 40s
Test / Linux (nightly-6.1 - jammy)	4m 48s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	5m 5s
Soundness / Format check	44s
Soundness / License headers check	11s
Soundness / Shell check	36s
Soundness / Unacceptable language check	3s
Soundness / Python lint check	4s
Soundness / YAML lint check	6s
	2h 51m 26s

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