DynamicallyAccessed 实际上是 net5.0 开始的

[walterlv]

https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.dynamicallyaccessedmembertypes

[Copilot]

Pull Request Overview

This PR corrects the minimum .NET version requirement for DynamicallyAccessed attributes from .NET 6.0 to .NET 5.0, aligning with the official Microsoft documentation. The changes update conditional compilation directives and comments to reflect the accurate version availability.

• Updated conditional compilation from NET6_0_OR_GREATER to NET5_0_OR_GREATER for DynamicallyAccessed polyfill
• Corrected documentation comments to indicate .NET 5.0 as the starting version
• Added .NET 9.0 to the test framework targets and included analyzer debugging configuration

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
DynamicallyAccessed.g.cs	Updated conditional compilation directive to target .NET 5.0+ instead of .NET 6.0+
FeatureGenerator.cs	Corrected comment to reflect .NET 5.0 as the starting version for DynamicallyAccessed
DotNetCampus.LatestCSharpFeatures.Tests.csproj	Added .NET 9.0 to target frameworks list
launchSettings.json	Added new analyzer debugging configuration

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