deprecate(libraries-for-the-rest-api): octocat.rs is WIP and unmaintained

[Malix-Labs]

Why:

octocat.rs is WIP and unmaintained

What's being changed (if available, include any code snippets, screenshots, or gifs):

Deprecating the mention of octocat.rs

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[Copilot]

Pull Request Overview

This pull request deprecates an unmaintained Rust library reference for the GitHub REST API documentation.

• Removed the Octocat library entry from the "Libraries for the REST API" list in the Rust section.
• Adjusted documentation to only feature maintained libraries.

[github-actions]

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Source	Review	Production	What Changed
rest/using-the-rest-api/libraries-for-the-rest-api.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[Malix-Labs]

This is a very simple documentation change

No need to test, just check for the one line removal

[Sharra-writes]

Thanks for opening a PR! I'll get this triaged for review.