This branch updates our Rust toolchain to nightly-2024-01-20. To build
on this nightly, I've removed a no-longer-necessary feature flag, and
updated our mycelium deps to
hawkw/mycelium@1de8ba11f7a66b379aa532e647b2948d448bf2e9, which includes
fixes for a bunch of new warnings added on recent Rust toolchains.
This branch updates our Rust toolchain to
nightly-2024-01-20. To build on this nightly, I've removed a no-longer-necessary feature flag, and updated ourmyceliumdeps to hawkw/mycelium@1de8ba11f7a66b379aa532e647b2948d448bf2e9, which includes fixes for a bunch of new warnings added on recent Rust toolchains.