Update Rust to v1.78

[samypr100]

Summary

Updates rust to 1.78 in rust-toolchain.toml

See: https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html

Potential blockers

• homebre still on 1.77 - rust 1.78.0 Homebrew/homebrew-core#170649
• conda-forge still on 1.77 - https://anaconda.org/conda-forge/rust

[charliermarsh]

I think it's ok for us to upgrade rust-toolchain.toml but not the minimum Rust version in Cargo.toml (see astral-sh/ruff#11260).

[charliermarsh]

Which would let us upgrade without having to wait for Homebrew and Conda, IIRC.

[codspeed-hq]

CodSpeed Performance Report

Merging #3361 will improve performances by 5.78%

_{Comparing samypr100:rust-update-178 (5030cea) with main (1089abd)}

Summary

⚡ 1 improvements
✅ 11 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	samypr100:rust-update-178	Change
⚡	resolve_warm_jupyter	376.3 ms	355.7 ms	+5.78%

[charliermarsh]

Thank you!