Update actions/upload-artifact to @v4 #546

Job	Run time
Linux.1: Release / steps	12m 14s
Linux.2: Debug / steps	9m 21s
Linux.3: static / steps	13m 0s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	3m 3s
Linux.5: custom namespace / steps	12m 4s
Linux.6: clang / steps	10m 49s
Linux.7: vfx2023 / steps	11m 57s
macOS.1: Release / steps	1m 4s
macOS.2: Debug / steps	1m 20s
macOS.3: static / steps	1m 0s
macOS.4: pkgconfig=OFF, testing=OFF / steps	48s
macOS.5: macos-13 / steps	2m 21s
Windows.1: Release / steps	1m 55s
Windows.2: Debug / steps	2m 54s
Windows.3: static / steps	2m 38s
Windows.5: pkgconfig=OFF, testing=OFF / steps	2m 3s
Windows.6: vfx2022 / steps	2m 35s
	1h 31m 6s

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