Update build to use net462 because net461 is reaching end of support on 4/26/2022

[daxian-dbw]

PR Summary

Update build to use net462 because net461 is reaching end of support on 4/26/2022.
.NET Framework lifecycles can be found here: https://docs.microsoft.com/en-us/lifecycle/products/microsoft-net-framework

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure you've added one or more new tests
• Make sure you've tested these changes in terminals that PowerShell is commonly used in (i.e. conhost.exe, Windows Terminal, Visual Studio Code Integrated Terminal, etc.)
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed at PowerShell-Docs
    • Doc Issue filed:

Microsoft Reviewers: Open in CodeFlow

[ghost]

🎉 v2.2.4-beta1 has been released which incorporates this pull request. 🎉