Uprev Rust toolchain pins to 1.95.0 (#24684)

## Summary
- Bump the workspace Rust toolchain from `1.93.0` to `1.95.0` across
Cargo, Bazel, CI, release workflows, devcontainers, and the Codex
environment config.
- Refresh `MODULE.bazel.lock` so the Bazel Rust toolchain artifacts
match the new version.
- Leave purpose-specific toolchains unchanged, including the
`argument-comment-lint` nightly and the upstream `rusty_v8` `1.91.0`
build pin.
- Includes fixes for new lints from `just fix` and a few codex-authored
fixes for lints without a suggestion.

codex-rs/utils/cli/src/format_env_display.rs

@@ -8,7 +8,7 @@ pub fn format_env_display<S: AsRef<str>>(
 
     if let Some(map) = env {
         let mut pairs: Vec<_> = map.iter().collect();
-        pairs.sort_by(|(a, _), (b, _)| a.cmp(b));
+        pairs.sort_by_key(|(key, _)| *key);
         parts.extend(pairs.into_iter().map(|(key, _)| format!("{key}=*****")));
     }