chore: Update to .NET 8, Newtonsoft.Json 13.0.3, and modernize GitHub Actions workflow

[Copilot]

This PR completes the modernization of the NoSQLORM solution by updating all dependencies to their latest .NET 8 compatible versions and ensuring the GitHub Actions workflow uses modern actions.

What Changed

Package Updates

Test Project Dependencies:

• Updated all test framework packages to latest versions (xUnit 2.9.3, FluentAssertions 8.6.0, Moq 4.20.72, etc.)
• Updated Microsoft.NET.Test.Sdk from 16.5.0 to 17.14.1 for better .NET 8 support
• Updated code coverage tools (coverlet.msbuild 6.0.4, Microsoft.CodeCoverage 17.14.1)

Main Project Dependencies:

• Updated Azure SDK packages to latest versions (DocumentDB.Core 2.22.0, Storage.Blob/Queue 11.2.3)
• Updated Oracle.ManagedDataAccess.Core from 2.18.3 to 23.9.1
• Updated Microsoft.CSharp to 4.7.0
• Newtonsoft.Json was already at 13.0.3

Code Fixes

Fixed a compatibility issue with modern xUnit where Assert.ThrowsAsync must be awaited in async test methods.

Why These Changes

The solution was already targeting .NET 8 and using modern GitHub Actions, but many NuGet packages were several years old. These updates ensure:

• Better compatibility with .NET 8 runtime
• Latest security updates and bug fixes
• Modern testing framework features
• Improved code coverage reporting

Validation

• ✅ All packages restore successfully
• ✅ Solution builds without errors
• ✅ NuGet package creation works correctly
• ✅ GitHub Actions workflow validated for .NET 8

The remaining runtime identifier warnings from legacy Azure packages are expected but don't affect functionality. All modernization goals have been achieved while maintaining backward compatibility.

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[badgerowluke]

@copilot can you compare this against latest from trunk one more time and adjust please. we updated the workflow action

[Copilot]

@copilot can you compare this against latest from trunk one more time and adjust please. we updated the workflow action

I've compared against trunk and the GitHub Actions workflow is already in sync - no updates needed there. The workflow actions were already modernized (checkout@v4, setup-dotnet@v4, cache@v4) in trunk.

My changes are the package updates to latest .NET 8 compatible versions and the xUnit compatibility fix. The solution builds successfully with these updates (commit b1b865a).