Bump actions/download-artifact from 7 to 8 #4613

Job	Run time
pre-commit / link-check	16s
pre-commit / check-file-sizes	5s
pre-commit / pre-commit	1m 55s
windows / clang-build	2m 7s
windows / msvc-build (Debug)	3m 4s
mac / clang-build (Release)	2m 38s
mac / clang-build (Debug)	2m 13s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 28s
ubuntu / clang-build (ubuntu-24.04)	2m 53s
windows / msvc-build (Release)	3m 59s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 12s
windows / clang-test	2m 50s
mac / clang-test	4m 33s
ubuntu / clang-test (ubuntu-24.04)	8m 25s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 14s
mac / clang-test-extended	2m 34s
ubuntu / gcc-test (ubuntu-24.04)	8m 30s
windows / msvc-test	4m 46s
windows / clang-test-extended	3m 13s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 30s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	3m 19s
windows / msvc-test-extended	2m 51s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 28s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 23s
ubuntu / gcc-build-codecov	7m 34s
perf / ubuntu-gcc-build-perf-stats	1m 40s
perf / macos-clang-build-perf-stats	2m 12s
pages / build-doxygen-xml	19s
pages / build-scoreboard	15s
pages / build-sphinx	46s
pages / deploy-pages	0s
	1h 32m 12s

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