Fix broken dependabot/fetch-metadata action ref

[wooseopkim]

Why:

Closes: 36167

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

dependabot/fetch-metadata repository's current README seems to be using @v2. I've made commits (two because of mistakes) using that ref. But as the linter requires a full length SHA, I made an additional change. (TIL Dependabot counts as a third-party organization? Thought it was an official GitHub project.)

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 preview environment.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the review server. Please note that changes to the data directory will not show up in this table.

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Content directory changes

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Source	Preview	Production	What Changed
code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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

Here's the link to this ref: https://github.com/dependabot/fetch-metadata/tree/d7267f607e9d3fb96fc2fbe83e0af444713e90b7

[github-actions]

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

[subatoi]

Hi @wooseopkim, thanks for raising a PR for this! This is a good fix, and I'll get this merged for you now. Thanks for your interest in the GitHub docs

[github-actions]

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