chore: update auto-merge workflows to include major version bumps

[tablackburn]

This PR updates the auto-merge workflow to allow major version bumps for bot updates.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6d76c8d4-5e39-441c-8f63-60185dac9f5e

📥 Commits

Reviewing files that changed from the base of the PR and between 77a7e50 and 8dcb118.

📒 Files selected for processing (1)

• .github/workflows/auto-merge-bots.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-bot-automerge

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[Copilot]

Pull request overview

This PR updates the bot auto-merge GitHub Actions workflow to allow Dependabot PRs with major version bumps to be auto-merged (in addition to minor/patch), aligning the workflow behavior with the stated “allow major version bumps” goal.

Changes:

• Removes the conditional that previously blocked auto-merge for semver-major Dependabot updates.
• Renames the Dependabot merge step to reflect broader dependency update coverage.

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