[CI] Use dependabot to keep nugets up-to-date

[networkfusion]

Description

Issue reported in dependabot/dependabot-core#1303 (comment)
and (hopefully) fixed in dependabot/dependabot-core#9678 (or later)

Replaces #187

Motivation and Context

automatic updating of nugets.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.

Summary by CodeRabbit

• Chores
  • Enabled automated NuGet package dependency updates to maintain security and stability.

[coderabbitai]

Walkthrough

Adds a Dependabot configuration file at .github/dependabot.yml to automate NuGet package updates. The configuration targets the repository root and schedules dependency updates weekly on Wednesdays.

Changes

Cohort / File(s)	Change Summary
Dependabot Configuration \.github/dependabot\.yml	New file: Configures Dependabot to check for NuGet package updates weekly, with checks scheduled for Wednesdays targeting the repository root.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "[CI] Use dependabot to keep nugets up-to-date" directly and clearly summarizes the main change in the pull request, which is adding a Dependabot configuration to enable automatic weekly updates for NuGet packages. The title is concise, specific, and uses clear language without vague terms or noise, making it easy for teammates to understand the primary change when scanning project history.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-dependabot

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