* Update to cap-std 0.22.0. The main change relevant to Wasmtime here is that this includes the rustix fix for compilation errors on Rust nightly with the `asm!` macro. * Add itoa to deny.toml. * Update the doc and fuzz builds to the latest Rust nightly. * Update to libc 0.2.112 to pick up the `POLLRDHUP` fix. * Update to cargo-fuzz 0.11, for compatibility with Rust nightly. This appears to be the fix for rust-fuzz/cargo-fuzz#277.