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/state/src/runtime/memories.rs

@@ -511,7 +511,7 @@ WHERE so.thread_id = ? AND so.source_updated_at = ?
             }
         }
 
-        selected.sort_by(|a, b| a.thread_id.to_string().cmp(&b.thread_id.to_string()));
+        selected.sort_by_key(|entry| entry.thread_id.to_string());
 
         Ok(selected)
     }