fix(io): replace std::fs in async fns with tokio::fs · Xuanwo/reqsign@7535680

The following actions uses node12 which is deprecated and will be forced to run on node16: 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 uses Node.js version which is deprecated and will be forced to run on node20: 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 manifest key: target.cfg(target_arch = "wasm32").features

variants `Header` and `Query` are never constructed

function `expand_homedir` is never used

function `base64_encode` is never used

function `base64_decode` is never used

function `hex_sha1` is never used

function `hex_sha256` is never used

function `hmac_sha256` is never used

function `base64_hmac_sha256` is never used

function `hex_hmac_sha1` is never used

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