fix(autoupdate): Ensure GitHub API requests use token

[z-Fng]

Motivation and Context

When retrieve hash from GitHub API, the token was not included in the request header.

Changes

• fix(autoupdate): Ensure GitHub API requests use token.
• refactor(autoupdate): .

Related Issues/PRs:

• https://github.com/ScoopInstaller/Scoop/pull/6416
• https://github.com/ScoopInstaller/Scoop/issues/6381#issuecomment-3410135538
• https://github.com/ScoopInstaller/GithubActions/issues/64

How Has This Been Tested?

• https://github.com/z-Fng/Scoop-Extras/actions/runs/18986905102/job/54232436898

Checklist:

• [x] I have read the Contributing Guide.
• [x] I have ensured that I am targeting the develop branch.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated the tests accordingly.
• [x] I have added an entry in the CHANGELOG.

Summary by CodeRabbit

• Bug Fixes
  • Fixed missing API token in GitHub mode request headers, enabling proper authentication for GitHub-based autoupdate requests.

[coderabbitai[bot]]

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Walkthrough

Added GitHub API token authentication to the autoupdate mechanism. When extracting JSON hashes from GitHub's API, the code now conditionally attaches an Authorization header with the token and sets the appropriate API version header for authenticated requests.

Changes

Cohort / File(s)	Summary
GitHub API Authentication CHANGELOG.md, lib/autoupdate.ps1	Added conditional logic in find_hash_in_json to include Authorization header with GitHub token and X-GitHub-Api-Version header when requesting from api.github.com. Updated changelog with bug fix entry documenting the missing API token header addition.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Straightforward conditional header attachment with minimal new logic
• Changes are focused and directly related to a single feature
• Changelog update is documentation-only
• Consider verifying: token availability check logic, header formatting correctness, and GitHub API version compatibility

Poem

🐰 A token now travels with every request,
Through GitHub's API gates, authenticated best,
Headers aligned, credentials in place,
Autoupdate hops forth at a swifter pace! 🚀

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title 'fix(autoupdate): Ensure GitHub API requests use token' is closely related to the main objective of the changeset, which is to add the missing API token to GitHub API request headers in autoupdate functionality. The title clearly communicates the core fix but is slightly less specific than the commit message or PR description. However, it accurately represents the primary change and would be understood by teammates reviewing the history.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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