fix: add /app/installation-requests to requires-app-auth paths

[Drew-Kimberly]

Resolves #593

Ensures List Installation Requests for the Authenticated App use an app JWT

Before the change?

Octokit requests to GET /app/installation-requests will throw the following error:

Error: [@octokit/auth-app] installationId option is required for installation authentication.

After the change?

Octokit requests to GET /app/installation-requests will make the request with an app JWT.

Pull request checklist

• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• [ ] Yes
• [x] No

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[github-actions[bot]]

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[github-actions[bot]]

:tada: This PR is included in version 6.0.5 :tada:

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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[github-actions[bot]]

:tada: This PR is included in version 7.0.0-beta.8 :tada:

The release is available on:

• GitHub release
• npm package (@beta dist-tag)

Your semantic-release bot :package::rocket: