fix(ci): use squash merge for dependabot auto-merge

[davidkonigsberg]

Description

Fixes the CI failure on dependabot PRs (e.g. #13540) where the auto-merge job fails with:

GraphQL: Merge method merge commits are not allowed on this repository (enablePullRequestAutoMerge)

Changes Made

• Changed gh pr merge --auto --merge to gh pr merge --auto --squash in .github/workflows/dependabot.yml to match the repository's allowed merge methods.

Testing

• This change can only be verified by a subsequent dependabot PR triggering the workflow.

Review Checklist

• Confirm that squash is the intended merge strategy for dependabot PRs on this repo.

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Link to Devin Session
Requested by: @davidkonigsberg

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