Build(deps): Bump actions/upload-artifact from 6 to 7 #688

Job	Run time
build (ubuntu-22.04, g++-10, gcc-10, g++-10)	12m 52s
build (macos-15, Xcode_16.4)	10m 51s
build (ubuntu-22.04, clang-15, clang-15, clang++-15)	12m 25s
build (ubuntu-24.04, g++-14, gcc-14, g++-14)	14m 24s
build (macos-15-intel, Xcode_26.0)	18m 20s
build (macos-15, Xcode_26.0)	10m 53s
build (ubuntu-22.04, g++-12, gcc-12, g++-12)	13m 45s
build (ubuntu-24.04, clang-18, clang-18, clang++-18)	12m 19s
build (macos-14, Xcode_16.2)	9m 37s
build (ubuntu-22.04, clang-13, clang-13, clang++-13)	12m 58s
	2h 8m 24s

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