generate_random_id causes panic with a lot of concurrent requests

[griffi-gh]

grammers version: git, 3d0b640

thread 'tokio-runtime-worker' panicked at /home/user/.cargo/git/checkouts/grammers-.../.../lib/grammers-mtsender/src/lib.rs:84:14
called `Result::unwrap()` on an `Err` value: 1738451223170673220

backtrace:

stack backtrace:
   0: rust_begin_unwind
             at /rustc/b1a7dfb91106018f47ed9dc9b27aee1977682868/library/std/src/panicking.rs:692:5
   1: core::panicking::panic_fmt
             at /rustc/b1a7dfb91106018f47ed9dc9b27aee1977682868/library/core/src/panicking.rs:75:14
   2: core::result::unwrap_failed
             at /rustc/b1a7dfb91106018f47ed9dc9b27aee1977682868/library/core/src/result.rs:1704:5
   3: core::result::Result<T,E>::unwrap
             at /nix/store/zs37f02gamiz3v5z83lqkq3n99rdgvw0-rust-nightly-complete-with-components-2025-01-11/lib/rustlib/src/rust/library/core/src/result.rs:1109:23
   4: grammers_mtsender::generate_random_id
             at .../grammers-.../.../lib/grammers-mtsender/src/lib.rs:82:9
   5: grammers_mtsender::Sender<T,M>::on_ping_timeout
             at .../grammers-.../.../lib/grammers-mtsender/src/lib.rs:459:23
   6: grammers_mtsender::Sender<T,MRayon: detected unexpected panic; aborting
>::step::{{closure}}
             at .../grammers-.../.../lib/grammers-mtsender/src/lib.rs:291:17

[Lonami]

My understanding of atomics was that this couldn't really happen, but that's clearly flawed. Since you seem able to reproduce the issue, would you mind attempting a fix and sending a PR? Perhaps we can just replace it with a Mutex? But if you know of a way to make it work with atomics, that'd be great.

[griffi-gh]

i just ended up patching the crate to ignore the error for my project, but a proper solution would be nice