`rust-toolchain.toml`: Upgrade to `nightly-2024-04-01`#943

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kkysen merged 3 commits intomainfrom

kkysen/update-rustc

Apr 1, 2024

Commits on Apr 1, 2024

`rust-toolchain.toml`: Upgrade to `nightly-2024-04-01`.
kkysen
committed
`#![feature(c_str_literals)]`: Use `c""` strings as they are now stable.
kkysen
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`fn BitDepth::{cast_coef_slice,select_into}`: `_`-prefix unused methods detected by the updated rustc.
kkysen
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