ci: update to upload/download actions v4 #1652

Job	Run time
Build (ubuntu-22.04)	1m 6s
Build-Executable-windows-2019	1m 55s
Docker-setup-cpp-ubuntu-llvm	5m 30s
Build-Executable-ubuntu-20.04	44s
Test-windows-2022	11m 14s
Docker-setup-cpp-fedora-llvm	4m 58s
Build-Executable-macos-13	2m 20s
Test-windows-2019	16m 32s
Docker-setup-cpp-arch-llvm	7m 3s
Build-Executable-macos-14	1m 7s
Test-ubuntu-24.04	6m 1s
Docker-setup-cpp-ubuntu-mingw	3m 56s
Test-ubuntu-22.04	6m 6s
Test-ubuntu-20.04	6m 39s
Test-macos-15	5m 22s
Test-macos-14	5m 7s
Test-macos-13	7m 24s
Release	0s
	1h 33m 4s

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