chore: update curl to current 8.18.0

[curtdept]

This PR updates the curl dependency to the latest released 8.18.0 and modifies the preinstall script to point to the appropriate subdirectory.

8.18.0 is needed to mitigate a large number of identified CVEs in this package since the previous bump.

Release information and package for curl: https://github.com/curl/curl/releases/tag/curl-8_18_0

Relates to: #159

Checklist

• I have run npm install to generate the package-lock.json correctly and included it in the PR.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[curtdept]

@godcrampy can you help push this along please? Scanning tools have been quite unhappy for some time about this. Fork test on a clean up to date repo was successful.

https://github.com/curtdept/aws-lambda-nodejs-runtime-interface-client/actions/runs/21960662538

[Copilot]

Pull request overview

This PR aims to update the curl dependency from an older version to 8.18.0 to mitigate multiple CVEs. The change modifies the preinstall script to reference a version-specific subdirectory when extracting and building curl.

Changes:

• Updated CURL_DIR path in preinstall script to include version-specific subdirectory (curl-8.18.0)

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