Feature/upgrade dependencies

[AThraen]

I upgraded to .net 8 (as .net 6 is end of life a long time ago). And updated dependencies to Sixlabor to avoid vulnerabilities - also made the dependency open-ended to avoid future issues.

[gemini-code-assist]

Summary of Changes

Hello @AThraen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on modernizing the project by upgrading its core framework to .NET 8 and updating several critical dependencies. The primary objectives are to enhance security by patching known vulnerabilities in the SixLabors libraries and to improve maintainability through a more flexible dependency management strategy. These changes bring the project up-to-date with the latest .NET ecosystem, contributing to overall stability and performance.

Highlights

• .NET 8 Upgrade: The project's target framework has been upgraded from .NET 6 to .NET 8 across all relevant projects, ensuring compatibility with the latest framework features and long-term support.
• SixLabors Dependency Updates and Security Fixes: Key SixLabors packages (ImageSharp, Fonts, ImageSharp.Drawing) have been updated to their latest versions, specifically addressing several reported CVEs (CVE-2024-32036, CVE-2024-27929, CVE-2024-32035) to enhance security.
• Open-Ended SixLabors Dependencies: The SixLabors package references have been modified to use open-ended version ranges (e.g., [2.1.3,)), allowing for automatic consumption of future minor and patch updates without requiring manual project file modifications.
• System.Drawing.Common Integration: The System.Drawing.Common package has been added to the main project, likely to support image manipulation functionalities under the .NET 8 framework.
• Test Dependency Updates: Various test-related dependencies, including coverlet, FakeItEasy, Microsoft.NET.Test.Sdk, and xunit, have been updated to their latest versions to maintain a robust testing environment.

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[gemini-code-assist]

Code Review

This pull request successfully upgrades the project to .NET 8 and updates several dependencies, including SixLabors packages to address security vulnerabilities. My review focuses on two main points:

1. The use of open-ended versioning for the SixLabors dependencies, which can introduce instability. I've recommended pinning them to specific versions.
2. The addition of the System.Drawing.Common package. This is a critical issue as it breaks cross-platform compatibility, which is a key feature of this library. I've provided guidance on how to remove this dependency by refactoring a color validation method to use ImageSharp's own capabilities.

Overall, the dependency upgrades are a great improvement, but the two issues above should be addressed before merging.

[Copilot]

Pull request overview

Upgrades the solution to .NET 8 and refreshes several dependencies (notably SixLabors) as part of addressing reported vulnerabilities, including updating color parsing to rely on ImageSharp for cross-platform support.

Changes:

• Retargeted projects from net6.0 to net8.0.
• Updated SixLabors packages (and made their versions open-ended) and refreshed test dependencies.
• Switched HTML color validation to SixLabors.ImageSharp.Color.TryParse and expanded unit tests for named colors.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Geta.Optimizely.ContentTypeIcons.Tests/ThumbnailIconControllerTests.cs	Adds coverage for named-color parsing and minor test cleanup.
tests/Geta.Optimizely.ContentTypeIcons.Tests/Geta.Optimizely.ContentTypeIcons.Tests.csproj	Retargets to net8 and upgrades test/coverage packages.
src/Geta.Optimizely.ContentTypeIcons/Geta.Optimizely.ContentTypeIcons.csproj	Retargets to net8; updates SixLabors dependencies to open-ended version ranges.
src/Geta.Optimizely.ContentTypeIcons/Controllers/ContentTypeIconController.cs	Replaces regex/System.Drawing-based color validation with ImageSharp parsing.
src/Geta.Optimizely.ContentTypeIcons.EnumGenerator/Geta.Optimizely.ContentTypeIcons.EnumGenerator.csproj	Retargets to net8 and upgrades Newtonsoft/Octokit.
sandbox/Alloy/AlloyMvcTemplates.csproj	Retargets sandbox to net8.
README.md	Updates the platform badge to .NET 8.
CHANGELOG.md	Adds a 3.0.0 entry describing the upgrade and dependency changes.

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