Remove lazy_static dependency

[mrhrzg]

By bumping the rust version to 1.80, the dependency on lazy_static becomes obsolete, see their docs. It is replaced with std::sync::LazyLock

[bikeshedder]

Sorry for the slow response. I just came around writing my reasoning why I haven't merged this, yet.

I usually try to follow the Tokio minimum Rust version: https://github.com/tokio-rs/tokio?tab=readme-ov-file#supported-rust-versions

• Tokio currently supports Rust 1.71.
• Rust 1.80 was released 2024-07-25

I guess it's safe to upgrade the minimum rust version to 1.80 but at the same time I hope this doesn't break any builds? Since I have a few smaller changes going which result in a breaking release anyways it might be a good time to bump the minimum rust version at the same time.

btw. also see the original PR where this was discussed a bit as well:

• feat(deadpool): cache num_cpus for better init performance #440

The PR originally used LazyLock as well and the author switched to lazy_static to honor the Rust 1.75 minimum version requirement.