Add `Headers.get_as_optional_string` and `get_as_string` · awslabs/mountpoint-s3@621f8a4

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/cache@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Run Shuttle tests: vendor/fuser/src/ll/mod.rs#L14

unused import: `RequestError`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L5

unexpected `cfg` condition value: `libfuse2`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L9

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L11

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L22

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L50

unexpected `cfg` condition value: `libfuse2`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L52

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L56

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/mod.rs#L59

unexpected `cfg` condition value: `libfuse3`

Run Shuttle tests: vendor/fuser/src/mnt/fuse2.rs#L58

unexpected `cfg` condition value: `bitrig`

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