Upgrade to .NET 10 with multi-targeting

[Copilot]

.NET 10 Upgrade - COMPLETED ✅

All Changes Completed Successfully:

• Update SomeClassLib.csproj to target net9.0 and net10.0 (multi-target)
• Add .NET 10 version property and conditional package references for .NET 10
• Update SomePeerDependency.csproj to target net9.0 and net10.0 (multi-target)
• Update SomeClassLib.Tests.csproj to target net10.0
• Update GitHub Actions workflows (CI.yml, PreRelease.yml, Release.yml) to use actions/setup-dotnet@v5 and dotnet-version: 10.0.x
• Build and test the updated project to verify changes
• Fix code review feedback (ImplicitUsing -> ImplicitUsings typo)
• Use MSBuild variables in conditional package references
• Run security checks (0 vulnerabilities found)

Summary of Changes:

Project Files:

• Removed net8.0 target framework
• Added net10.0 target framework
• Updated all projects to multi-target net9.0 and net10.0
• Added conditional package references using MSBuild variables for .NET 9 and .NET 10
• Fixed ImplicitUsings property name in test project

GitHub Actions Workflows:

• Updated from actions/setup-dotnet@v4 to actions/setup-dotnet@v5
• Updated from dotnet-version: 9.0.x to dotnet-version: 10.0.x
• Applied to all three workflows: CI.yml, PreRelease.yml, Release.yml

Verification Results:

• ✅ Build successful for both net9.0 and net10.0 targets
• ✅ All tests passing on .NET 10 (1 test passed)
• ✅ Package creation successful with both frameworks included
• ✅ Multi-targeting verified (net9.0 and net10.0 assemblies present)
• ✅ Conditional package references verified (net9.0 uses 9.0.0 packages, net10.0 uses 10.0.0 packages)
• ✅ Code review feedback addressed
• ✅ Security scan completed (0 vulnerabilities)

Security Summary:

No security vulnerabilities were found in the changes.

Original prompt

Upgrade this library to .NET 10

• TFM : .net9.0,.net10.0 (multi-target)
• build scripts, update to actions/setup-dotnet@v5 and .net 10

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[johnkors]

@copilot , check comments and update

[Copilot]

@copilot , check comments and update

Updated both conditions to use MSBuild variables as requested. The conditional package references now properly use $(DotNet9Version) and $(DotNet10Version) for framework matching, with separate package version variables. Build and tests verified successfully. Commit: af247f0