chore: Set package ecosystem to 'nuget' in dependabot config

[steingran]

Description

Setting up Dependabot for version updates

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🧪 Test improvements
• ⚡ Performance improvement
• ♻️ Code refactoring
• 🔧 Maintenance/chore

Related Issue

Changes Made

• Adds a dependabot.yml file
• Configures Dependabot for automatic version updates
• Set up to run weekly

Testing

• Unit tests pass locally
• Integration tests pass locally
• Added new tests for new functionality
• All existing tests still pass

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Labels

Additional Notes

[Copilot]

Pull Request Overview

This PR adds Dependabot configuration to enable automated dependency updates for the project. Dependabot will monitor NuGet packages and automatically create pull requests to keep dependencies up-to-date.

• Configures Dependabot to monitor NuGet packages in the repository
• Sets up weekly automated dependency update checks

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