github-action: include the dependabot section for pre-commit

[elastic-vault-github-plugin-prod]

Details

⚠️ This PR was created by an automated tool. Please review the changes carefully. ⚠️

We want to enable the dependabot for pre-commit.

Why

We want to secure our dependencies and keep them up to date.

If there are any questions, please reach out to the @elastic/observablt-ci

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @elastic-vault-github-plugin-prod[bot]? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8.19 is the label to automatically backport to the 8.19 branch.
• backport-9./d is the label to automatically backport to the 9./d branch. /d is the digit.
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[fr4nc1sc0-r4m0n]

LGTM