Dependabot version updates

[live-wire]

💸 TL;DR

This PR enables Dependabot for automatic daily updates of GitHub Actions workflows and Go module dependencies. This ensures our dependencies stay up-to-date, secure, and maintainable. Dependabot will automatically open PRs for any dependency updates.

📜 Details

• Adds .github/dependabot.yml with daily schedule for both GitHub Actions and Go dependencies (gomod).
• No breaking changes or external dependency changes beyond configuring Dependabot itself.

🧪 Testing Steps / Validation

• Confirmed valid syntax according to Dependabot docs.
• Once merged, Dependabot will automatically create PRs for dependency updates, verifying the integration.

✅ Checks

• CI tests (if present) are passing
• Adheres to code style for repo
• I am a Reddit employee

[karanthukral]

Thanks for creating this PR. I am just digging into our general policy of using dependabot for OSS repos here. I'll follow up. Thanks