Update Rust to 1.80.0 (#8518)

We keep the practice of keeping the compiler up to date, pointing to the
latest release. This is done by many other projects in the Rust ecosystem as well.

[Release notes](https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-180-2024-07-25).

Prior update was in #8048

proxy/src/proxy/tests/mitm.rs

@@ -1,7 +1,7 @@
 //! Man-in-the-middle tests
 //!
 //! Channel binding should prevent a proxy server
-//! - that has access to create valid certificates -
+//! *that has access to create valid certificates*
 //! from controlling the TLS connection.
 
 use std::fmt::Debug;

proxy/src/scram/countmin.rs

@@ -158,7 +158,7 @@ mod tests {
         let N = 1021 * 4096;
         let sketch = CountMinSketch::with_params(p / N as f64, 1.0 - q);
 
-        let memory = std::mem::size_of::<u32>() * sketch.buckets.len();
+        let memory = size_of::<u32>() * sketch.buckets.len();
         let time = sketch.depth;
         (memory, time)
     }