Bump actions/upload-artifact from 5 to 6 #11530

Job	Run time
check-ubuntu-24_04-make-gcc	19m 46s
check-ubuntu-24_04-arm-cmake-gcc	11m 58s
check-ubuntu-22_04-cmake-gcc	14m 59s
check-ubuntu-22_04-cmake-gcc-32bit	16m 30s
check-ubuntu-24_04-cmake-gcc-14	14m 30s
check-ubuntu-24_04-cmake-gcc-KNOWNBUG	3m 42s
check-ubuntu-24_04-make-clang-smt-z3	6m 16s
check-ubuntu-24_04-cmake-gcc	17m 25s
check-ubuntu-22_04-make-clang	17m 53s
check-ubuntu-24_04-make-clang	26m 47s
check-ubuntu-24_04-cmake-gcc-THOROUGH	8m 36s
check-vs-2022-make-build-and-test	1h 5m 35s
check-string-table	1m 42s
check-macos-15-intel-make-clang	29m 58s
include-what-you-use	12m 4s
check-vs-2025-cmake-build-and-test	1h 0m 22s
windows-msi-package	28m 11s
check-macos-14-cmake-clang	1h 52m 27s
check-docker-image	20m 40s
	8h 9m 21s

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