Bump actions/checkout from 6 to 7 #5090

Job	Run time
ci-scope	6s
pre-commit / link-check	40s
pre-commit / pre-commit	2m 10s
windows / clang-build	3m 21s
windows / msvc-build (Debug)	3m 1s
ubuntu / gcc-build (ubuntu-26.04, Release)	2m 57s
ubuntu / clang-build (ubuntu-26.04)	2m 51s
ubuntu / gcc-build (ubuntu-26.04, Debug)	2m 13s
windows / msvc-build (Release)	3m 58s
mac / clang-build (Release)	2m 44s
mac / clang-build (Debug)	2m 1s
ubuntu / gcc-test (ubuntu-26.04)	2m 40s
ubuntu / clang-test (ubuntu-26.04)	2m 41s
ubuntu / clang-sanitizer-build (ubuntu-26.04)	3m 35s
mac / clang-test	1m 35s
windows / clang-test	1m 31s
windows / msvc-test	2m 32s
ubuntu / gcc-test-extended (ubuntu-26.04)	2m 16s
ubuntu / clang-test-extended (ubuntu-26.04)	1m 43s
ubuntu / clang-sanitizer-test (ubuntu-26.04)	1m 1s
windows / clang-test-extended	1m 18s
ubuntu / clang-sanitizer-test-extended (ubuntu-26.04)	1m 2s
windows / msvc-test-extended	1m 56s
mac / clang-test-extended	1m 20s
ubuntu / gcc-build-codecov	4m 6s
perf / ubuntu-gcc-build-perf-stats	58s
perf / macos-clang-build-perf-stats	1m 59s
pages / build-scoreboard	18s
pages / build-doxygen-xml	16s
pages / build-sphinx	37s
pages / deploy-pages	0s
	59m 26s

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