http-parser: deprecate

[samford]

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The GitHub repository for http-parser was archived sometime between 2022-10-06 and 2022-11-09 but the following message was added to the README on 2020-10-01:

http-parser is not actively maintained. New projects and projects looking to migrate should consider llhttp.

This PR deprecates the formula accordingly.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.