Sync with TemplateDotNetLibrary: action versions, NuGet bumps, and csproj structure

[Copilot]

Brings the repository in sync with recent changes merged into the TemplateDotNetLibrary template (PRs #16–#19).

Description

GitHub Actions versions

• upload-artifact@v6 → @v7 (build.yaml, 6 occurrences)
• download-artifact@v7 → @v8 (release.yaml, 2 occurrences)

Dependabot

• Added groups for github-actions ecosystem — batches all action updates into one PR

NuGet dependency updates

• SonarAnalyzer.CSharp 10.19.0.132793 → 10.20.0.135146 (both projects)
• Microsoft.NET.Test.Sdk 18.0.1 → 18.3.0 (test project)

csproj structure (template PR #19)

• LangVersion: 12 → latest (both projects)
• Library csproj: split single ItemGroup into labelled Build Tool Dependencies and Code Analysis Dependencies sections with explanatory comments on PrivateAssets/IncludeAssets usage
• Test csproj: same split into Test Framework Dependencies and Code Analysis Dependencies; added comment on coverlet.collector configuration
• Windows .NET Framework test target: net462 → net481

Requirements

• Updated net462@ source filters in requirements.yaml to net481@ to match the new test target framework

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvement

Pre-Submission Checklist

Before submitting this pull request, ensure you have completed the following:

Build and Test

• Code builds successfully: dotnet build --configuration Release
• All unit tests pass: dotnet test --configuration Release
• Code produces zero warnings

Code Quality

• Code formatting is correct: dotnet format --verify-no-changes
• New code has appropriate XML documentation comments
• Static analyzer warnings have been addressed

Quality Checks

Please run the following checks before submitting:

• Spell checker passes: cspell "**/*.{md,cs}"
• Markdown linter passes: markdownlint "**/*.md"
• YAML linter passes: yamllint .

Testing

• Added unit tests for new functionality
• Updated existing tests if behavior changed
• All tests follow the AAA (Arrange, Act, Assert) pattern
• Test coverage is maintained or improved

Documentation

• Updated README.md (if applicable)
• Updated ARCHITECTURE.md (if applicable)
• Added code examples for new features (if applicable)
• Updated requirements.yaml (if applicable)

Additional Notes

Tracked against template commits: upload-artifact bump, PR #16 (download-artifact v8), PR #17 (dependabot grouping), PR #18 (NuGet bumps), PR #19 (csproj restructure).

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Malcolmnixon]

@copilot did you forget to update the test source filters in the requirements file when you updated from net462 to net481?

[Copilot]

@copilot did you forget to update the test source filters in the requirements file when you updated from net462 to net481?

Good catch — yes, the net462@ source filters in requirements.yaml were missed. Fixed in 3efab47.