WIP: [Release] Verify release-21.0.0-rc4 #45448

Job	Run time
AMD64 Windows MinGW ${{ matrix.mingw-n-bits }} GLib & Ruby	0s
AMD64 Windows MSVC GLib	0s
ARM64 macOS 14 GLib & Ruby	0s
AMD64 Ubuntu ${{ matrix.ubuntu }} GLib & Ruby	-6s
	-6s

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