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.

.github/workflows/rust-release-windows.yml

@@ -100,7 +100,7 @@ jobs:
           Write-Host "Total RAM: $ramGiB GiB"
           Write-Host "Disk usage:"
           Get-PSDrive -PSProvider FileSystem | Format-Table -AutoSize Name, @{Name='Size(GB)';Expression={[math]::Round(($_.Used + $_.Free) / 1GB, 1)}}, @{Name='Free(GB)';Expression={[math]::Round($_.Free / 1GB, 1)}}
-      - uses: dtolnay/rust-toolchain@a0b273b48ed29de4470960879e8381ff45632f26 # 1.93.0
+      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
         with:
           targets: ${{ matrix.target }}