Cargo.toml: bump `chacha20` to v0.10.0-rc.5 (#1683) #1478

Job	Run time
Check doc	20s
Check Clippy and rustfmt	22s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	49s
test (macos-latest, x86_64-apple-darwin, stable)	39s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 26s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.85.0)	36s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	56s
test-no-std	15s
test-miri	3m 56s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	31s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	41s
test (windows-latest, x86_64-pc-windows-gnu, stable)	1m 12s
test-ios	19s
	12m 2s

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