Prepare release `2.6.0-rc.0` #93

Job	Run time
check / test linux x86-64	26m 1s
release / build x86_64-unknown-linux-gnu	13m 12s
check / test macos aarch64	12m 20s
release / build x86_64-unknown-linux-musl	13m 40s
check / test windows x86-64	29m 14s
release / build aarch64-unknown-linux-gnu	14m 1s
release / build aarch64-unknown-linux-musl	14m 1s
release / build x86_64-apple-darwin	40m 23s
release / build aarch64-apple-darwin	13m 7s
release / build x86_64-pc-windows-msvc	25m 52s
release / verify ubuntu-20.04 x86_64-unknown-linux-gnu	24s
release / verify ubuntu-22.04 x86_64-unknown-linux-gnu	34s
release / checksums	8s
release / verify macos-14 aarch64-apple-darwin	46s
release / verify windows-2019 x86_64-pc-windows-msvc	2m 33s
draft release	11s
	3h 26m 27s

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