Remove unneeded permission in auto-merge example

[felipecrs]

And simplify the workflow a little.

Why:

Closes [issue link]

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Source	Preview	Production	What Changed
content/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions.md	Modified	Original

[felipecrs]

I tested this in https://github.com/vscode-shellcheck/vscode-shellcheck/blob/master/.github/workflows/dependabot-auto-merge.yaml

[ramyaparimi]

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

[felicitymay]

@ramyaparimi - since this deals with actions and permissions, this will need an SME review from either actions and/or Dependabot.

[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[mchammer01]

@felipecrs - thanks for your contribution ✨
I've accepted the change about the permission but will revert the updates made to ${{ following consultation with the Dependabot team. You are right in that we could remove these but most of our examples throughout the docs contain them so we'll keep them for consistency for now.
Thanks again for helping us improve our docs!

[mchammer01]

LGTM

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡

[felipecrs]

@mchammer01 it makes sense. Thank you!