Update to .NET 10 SDK

[martincostello]

Update to build and test with .NET 10. net10.0 is explicitly not being added as a new TFM for the packages we ship to NuGet.org.

Changes include:

• Build with the .NET 10 SDK.
• Add net10.0 to the test projects.
• Use C# 14 features where relevant.
• Use Cake.Sdk.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (d7a9670) to head (bdbf75f).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2531   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         309      309           
  Lines        7127     7128    +1     
  Branches     1005     1005           
=======================================
+ Hits         6853     6854    +1     
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <100.00%> (+<0.01%)	⬆️
macos	96.15% <100.00%> (+<0.01%)	⬆️
windows	96.14% <100.00%> (+<0.01%)	⬆️

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[martincostello]

Depends on stryker-mutator/stryker-net#3327.

[Frulfump]

Depends on stryker-mutator/stryker-net#3327.

This is closed as completed now and a new version of Stryker is published, seems like there's been a few reported issues though.

[Copilot]

Pull request overview

This PR updates the project to build and test with the .NET 10 SDK while maintaining backward compatibility. The update includes adopting C# 14 features and modernizing the build system with Cake.Sdk.

• Updates .NET SDK from 9.0.308 to 10.0.100
• Adds net10.0 target framework to test, benchmark, and sample projects
• Adopts C# 14 semi-auto properties with field keyword
• Migrates build scripts to use Cake.Sdk
• Removes explicit System.Text.Json package references (included in .NET 10 framework)

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
global.json	Updates SDK version to 10.0.100 and adds Cake.Sdk 6.0.0 reference
cake.cs	Migrates to Cake.Sdk format with new directive syntax and removes unused helper function
build.ps1	Updates script name reference from build.cake to cake.cs and adjusts dotnet command invocation
bench/benchmarks.ps1	Updates benchmark framework target from net9.0 to net10.0
bench/Polly.Core.Benchmarks/Polly.Core.Benchmarks.csproj	Adds net10.0 to target frameworks
bench/Polly.Benchmarks/Polly.Benchmarks.csproj	Adds net10.0 to target frameworks
test/*.csproj (6 files)	Adds net10.0 to test project target frameworks
test/Polly.AotTest/Polly.AotTest.csproj	Updates single target framework from net9.0 to net10.0
samples/*.csproj (5 files)	Updates sample project target frameworks from net9.0 to net10.0
src/Snippets/Snippets.csproj	Updates target framework to net10.0 and removes System.Text.Json package reference
samples/Chaos/Chaos.csproj	Updates target framework to net10.0 and removes System.Text.Json package reference
src/Polly/Context.Dictionary.cs	Refactors to use C# 14 semi-auto property with field keyword
test/Polly.Specs/Helpers/Bulkhead/TraceableAction.cs	Refactors Status property to use C# 14 semi-auto property with field keyword
Directory.Packages.props	Removes System.Text.Json package version and adds net10.0-specific package version overrides
eng/stryker-config.json	Updates target framework to net10.0 and sets language version to Preview

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[martincostello]

I know - it's just an old PR as it was waiting on the stryker fix. Automation can update it post merge anyway.

[martincostello]

#2881