Update project to .NET 10

[Copilot]

The project was targeting the EOL netcoreapp3.1 framework with stale, unused dependencies including one with a known high severity vulnerability.

Changes

DotNetStatic.csproj

• TargetFramework: netcoreapp3.1 → net10.0
• Removed System.Text.Json 8.0.4 — unused, redundant (built into .NET 10), and carries GHSA-8g4q-xg66-9fp4
• Removed Utf8Json 1.3.7 — unused

azure-pipelines.yml

• CI pool image: windows-2019 → windows-2022

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update project to .NET 10</issue_title>
<issue_description>Upgrade the solution and all projects to target .NET 10.

Checklist

• Update all project files (*.csproj) to use the .NET 10 target framework
• Update NuGet dependencies as needed for .NET 10 compatibility
• Verify successful build and run all tests
• Update CI/CD configuration if necessary for .NET 10

Motivation

Keeping the project up to date ensures continued support, security, and access to new language/runtime features.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update project to .NET 10 #5

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