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/app-server-protocol/src/export.rs

@@ -948,10 +948,8 @@ impl ScanState {
             '(' => self.depth.paren += 1,
             ')' => self.depth.paren = (self.depth.paren - 1).max(0),
             '<' => self.depth.angle += 1,
-            '>' => {
-                if self.depth.angle > 0 {
-                    self.depth.angle -= 1;
-                }
+            '>' if self.depth.angle > 0 => {
+                self.depth.angle -= 1;
             }
             _ => {}
         }
@@ -2212,20 +2210,14 @@ mod tests {
                         continue;
                     }
                     match ch {
-                        '\\' => {
-                            if in_single || in_double {
-                                escape = true;
-                            }
+                        '\\' if (in_single || in_double) => {
+                            escape = true;
                         }
-                        '\'' => {
-                            if !in_double {
-                                in_single = !in_single;
-                            }
+                        '\'' if !in_double => {
+                            in_single = !in_single;
                         }
-                        '"' => {
-                            if !in_single {
-                                in_double = !in_double;
-                            }
+                        '"' if !in_single => {
+                            in_double = !in_double;
                         }
                         '{' if !in_single && !in_double => level_brace += 1,
                         '}' if !in_single && !in_double => level_brace -= 1,