Removed Newtonsoft.Json in favor of System.Text.Json

[xperiandri]

No description provided.

[Copilot]

Pull Request Overview

This PR removes the dependency on Newtonsoft.Json across the solution and migrates to System.Text.Json.

• Removes Newtonsoft.Json package references from project files.
• Updates JSON deserialization in the configuration module to use System.Text.Json.
• Updates Directory.Packages.props and CHANGELOG to reflect the changes.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/FSharpLint.Core/FSharpLint.Core.fsproj	Removed Newtonsoft.Json package reference
src/FSharpLint.Core/Application/Configuration.fs	Replaced Newtonsoft.Json usage with System.Text.Json and updated JSON configuration
src/FSharpLint.Console/FSharpLint.Console.fsproj	Removed Newtonsoft.Json package reference
Directory.Packages.props	Replaced Newtonsoft.Json package reference with System.Text.Json package
CHANGELOG.md	Updated changelog to document the removal of Newtonsoft.Json

Comments suppressed due to low confidence (1)

src/FSharpLint.Core/Application/Configuration.fs:562

• Switching to System.Text.Json is a good move; however, ensure that any F# option types used in Configuration are properly handled, as System.Text.Json does not natively support F# option serialization.

        JsonSerializer.Deserialize<Configuration>(configText, FSharpJsonConverter.jsonOptions)