Bump .NET 6 examples to .NET 8 (LTS)

[thomas11]

Builds started failing, probably due to a GH image upgrade.

You must install or update .NET to run this application.

App: /tmp/p-it-runner-cs-simple-60533703-3773144109/bin/Debug/net6.0/cs-simple

Architecture: x64

Framework: 'Microsoft.NETCore.App', version '6.0.0' (x64)

.NET location: /usr/share/dotnet

The following frameworks were found:

  8.0.12 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.12%. Comparing base (ab3d9fb) to head (1a0a57c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3868   +/-   ##
=======================================
  Coverage   57.12%   57.12%           
=======================================
  Files          79       79           
  Lines       12407    12407           
=======================================
  Hits         7087     7087           
  Misses       4793     4793           
  Partials      527      527           

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[pulumi-bot]

This PR has been shipped in release v2.83.0.