Clarify that dependabot auto-merge does not work with merge queues

[Enselic]

Why:

I tried using the example with a merge queue, but that did not work.

Document that so others don't have to try.

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

I'm adding a new Note. Rendered:

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.

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[Copilot]

Pull Request Overview

This pull request updates the documentation to clarify that dependabot auto-merge will not work if using a merge queue due to status checks not running.

• Added a new note detailing the limitation when merge queues are used.
• Updated the documentation to prevent user confusion regarding dependabot auto-merge behavior.

[github-actions]

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Source	Review	Production	What Changed
code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions.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

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[Sharra-writes]

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