Lower code analysis package version

[olstakh]

Using the lowest version that allows current source generator functionality to operate, to cover the most consumers

Version mappings: https://learn.microsoft.com/en-us/visualstudio/extensibility/roslyn-version-support?view=vs-2022

[Copilot]

Pull Request Overview

Lowers the Microsoft.CodeAnalysis.CSharp package version from 4.14.0 to 4.3.1 to improve compatibility with a broader range of consumers while maintaining source generator functionality.

• Version downgrade from 4.14.0 to 4.3.1 for Microsoft.CodeAnalysis.CSharp package
• Maintains required functionality while expanding consumer compatibility

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