Upgrade the Rust toolchain to 1.99.1 (#61205)

## What changed

- Update the workspace, Bazel toolchain and lockfile, CI and release workflows, and Windows setup script from Rust `1.95.0` to `1.99.1`.
- Adapt Rust code to the updated toolchain and Clippy lints, including `try_update` for atomics, `as_chunks` for fixed-size slices, and targeted allowances for generated tonic services.
- Refresh the halfwidth sound mark rendering snapshot to use literal characters in debug output.

GitOrigin-RevId: 5852029f687436dc814c2bca68141ee1f4a67d49

codex-rs/diagnostics/src/lib.rs

@@ -32,7 +32,7 @@ impl Gauge {
     pub fn decrement(&self) {
         let _ = self
             .value
-            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |value| {
+            .try_update(Ordering::Relaxed, Ordering::Relaxed, |value| {
                 Some(value.saturating_sub(1))
             });
     }