Add Dependabot Donut to menu 🍩

[ashleywolf]

What

Adds the Dependabot Donut to the snack menu — a donut that automatically keeps your hunger updated.

Why

Our café needs more automation-themed treats! The Dependabot Donut fills a gap in our snack lineup.

Testing

• Added test_dependabot_donut to verify the item appears on the menu with correct emoji, price, and category.
• All existing tests still pass.

[github-actions]

✅ Contribution Check: LGTM

This PR follows all contribution guidelines from CONTRIBUTING.md:

Strengths:

• ✅ Clear, descriptive title: "Add Dependabot Donut to menu 🍩" clearly explains what the PR does
• ✅ Complete description: Includes all required sections (What, Why, Testing)
• ✅ Proper implementation: New menu item added to menu.py as required
• ✅ Tests included: Added test_dependabot_donut to verify the new item
• ✅ Relevant changes: GitHub-themed menu item fits the project theme

Applied label: contribution-check/lgtm

Great work! This is exactly what we're looking for in contributions.

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