chore: bump all NuGet packages to latest

[erwan-joly]

• Microsoft.CodeAnalysis / Microsoft.CodeAnalysis.CSharp 5.3.0 -> 5.6.0
• Microsoft.NET.Test.Sdk 18.4.0 -> 18.8.1, MSTest 4.2.1 -> 4.3.3
• Roslyn testing packages 1.1.3 -> 1.1.4
• NosCore.Packets 16.0.0 -> 20.0.3

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated development and testing components to newer versions.
  • Improved compatibility with the latest C# analysis and testing tooling.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 0db4e3c4-1366-4910-a24a-c5220ce50a20

📥 Commits

Reviewing files that changed from the base of the PR and between 4c931ed and 9e5329b.

📒 Files selected for processing (2)

• src/NosCore.Analyzers/NosCore.Analyzers.csproj
• test/NosCore.Analyzers.Tests/NosCore.Analyzers.Tests.csproj

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Walkthrough

The pull request updates the analyzer project’s Roslyn package and refreshes package versions in the analyzer test project.

Changes

Package Updates

Layer / File(s)	Summary
Update project package versions src/NosCore.Analyzers/NosCore.Analyzers.csproj, test/NosCore.Analyzers.Tests/NosCore.Analyzers.Tests.csproj	The analyzer project updates Microsoft.CodeAnalysis.CSharp from 5.3.0 to 5.6.0. The test project updates its test, Roslyn, analyzer-testing, code-fix-testing, code-refactoring-testing, and packet package versions.

Estimated code review effort: 2 (Simple) | ~5 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/upgrade-all-packages

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