build

Bump actions/checkout from 4 to 5 #2031

Job	Run time
clang-format-and-update-docs	25s
macOS xcode-15.4	20s
macOS xcode-15.4-ninja in-source	22s
macOS xcode-15.4-ninja out-of-source	21s
Windows WIN-2025-VS-2022	4m 13s
Windows WIN-2025-VS-2022 (clangcl)	4m 16s
Windows WIN-latest-VS-2022 (clangcl)	4m 13s
Linux clang16	2m 41s
Linux gcc14	3m 23s
Linux clang15	3m 8s
Linux clang14	3m 8s
Windows WIN-latest-VS-2022	3m 53s
Linux gcc13	3m 3s
Linux gcc13 unity	2m 4s
Linux gcc13 ninja-unity	2m 29s
Linux gcc13 ninja out-of-source	3m 10s
Linux gcc12	4m 8s
Linux gcc13 ninja in-source	2m 30s
auto-merge	0s
	47m 47s

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