Add Dependabot configuration

[smoelius]

This PR adds a Dependabot configuration file to automatically keep dependencies up to date.

Changes

• Adds .github/dependabot.yml with appropriate configuration for this repository's technology stack
• Configures weekly updates for dependencies and GitHub Actions
• Sets reasonable PR limits to avoid spam
• Includes dependency-specific labels

Benefits

• Automated security updates for dependencies
• Regular version updates to keep dependencies current
• Reduced maintenance burden through automation
• Better visibility into dependency updates through labels

Configuration Details

The Dependabot configuration is tailored to this repository's needs:

• Update frequency: Weekly
• PR limits: 5-10 per ecosystem
• Labels: dependencies, ecosystem-specific labels

cc: @pbottine

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com