remove redundant alpha #1610

Job	Run time
build-linux	35s
build-windows-dynamic (x86-windows-gnu)	2m 36s
build-windows-dynamic (x86_64-windows-gnu)	1m 39s
build-cross-linux (ubuntu-latest, x86_64-linux-gnu)	5s
build-windows-dynamic (x86_64-windows-msvc)	1m 42s
build-cross-linux (ubuntu-latest, aarch64-linux-gnu)	5s
build-cross-windows (ubuntu-latest, x86-windows-gnu, static)	42s
build-cross-linux (macos-latest, x86_64-linux-gnu)	1m 30s
build-cross-windows (ubuntu-latest, x86-windows-gnu, dynamic)	41s
build-cross-linux (macos-latest, aarch64-linux-gnu)	9s
build-macos	1m 36s
build-cross-windows (ubuntu-latest, x86_64-windows-gnu, static)	50s
build-cross-linux (windows-latest, x86_64-linux-gnu)	2m 8s
build-windows-static (x86-windows-gnu)	1m 49s
build-cross-windows (ubuntu-latest, x86_64-windows-gnu, dynamic)	51s
build-windows-static (x86_64-windows-gnu)	2m 11s
build-cross-linux (windows-latest, aarch64-linux-gnu)	1m 6s
build-cross-windows (macos-latest, x86-windows-gnu, static)	2m 3s
build-cross-windows (macos-latest, x86-windows-gnu, dynamic)	2m 2s
build-cross-windows (macos-latest, x86_64-windows-gnu, static)	2m 35s
build-cross-windows (macos-latest, x86_64-windows-gnu, dynamic)	2m 8s
	29m 3s

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