Refine granularity of 400 and 502 error diagnostics · sozu-proxy/sozu@c978e0f

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

unused imports: `Block` and `Pair`

function `hex_and_ascii_dump` is never used

`sozu-lib` (lib) generated 2 warnings (run `cargo fix --lib -p sozu-lib` to apply 1 suggestion)

function `set_process_affinity` is never used

`sozu` (bin "sozu") generated 2 warnings

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

unused imports: `Block` and `Pair`

function `hex_and_ascii_dump` is never used

unused `#[macro_use]` import

unused imports: `Block` and `Pair`

`sozu-lib` (lib) generated 2 warnings (run `cargo fix --lib -p sozu-lib` to apply 1 suggestion)

unexpected `cfg` condition name: `tarpaulin`

function `set_workers_affinity` is never used

function `set_process_affinity` is never used

`sozu` (bin "sozu" test) generated 2 warnings

`sozu-lib` (lib test) generated 3 warnings (1 duplicate) (run `cargo fix --lib -p sozu-lib --tests` to apply 1 suggestion)

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