Rust 1.100.0

Rust 1.100.0 has been released with significant language stabilizations including the never type and custom extern ABIs, along with compiler improvements like enabling the next solver by default in orphanhood checking. The update introduces custom allocators support, new platform tiers (promoting wasm32-wasip3 to Tier 2 and adding powerpc64-sony-ps3 as Tier 3), and expands Cargo's linting system with new built-in checks for unused dependencies.