Add .NET 10 to test matrix

[Romfos]

Changes:

• Add .NET 10 to test matrix
• Simplify dependabot config

Note: release in november

[Copilot]

Pull Request Overview

This PR adds .NET 10 support to the project's test matrix and CI/CD pipelines. The changes prepare the project to test against the upcoming .NET 10 framework alongside existing .NET 8, 9, and .NET Framework 4.6.2 targets.

Key changes:

• Added net10.0 target framework to test projects
• Updated GitHub Actions workflows to include .NET 10.0.x setup and testing
• Updated NUnit3TestAdapter package version to 5.2.0 for compatibility

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/NSubstitute.Documentation.Tests/NSubstitute.Documentation.Tests.csproj	Added net10.0 target framework and upgraded NUnit3TestAdapter to 5.2.0
tests/NSubstitute.Benchmarks/NSubstitute.Benchmarks.csproj	Changed target framework from net8.0 to net10.0
tests/NSubstitute.Acceptance.Specs/NSubstitute.Acceptance.Specs.csproj	Added net10.0 target framework and upgraded NUnit3TestAdapter to 5.2.0
global.json	Added new configuration file specifying Microsoft.Testing.Platform as the test runner
.github/workflows/test.yml	Added .NET 10.0.x to setup-dotnet action, added .NET 10 test job, and added --no-progress flag to test commands
.github/workflows/release_packages.yml	Updated dotnet-version from 9.0.x to 10.0.x
.github/workflows/release_documentation.yml	Added 10.0.x to the multi-line dotnet-version configuration

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