Updates for .NET 8 - release-1.1

[particularbot]

• Set CI workflow dotnet-version to 8.0.x, 7.0.x, 6.0.x
• Set release workflow dotnet-version to 8.0.x
• Set test project target frameworks to (net481);net6.0;net7.0;net8.0
• Set pwsh as default shell for CI and Release workflows
• Use Particular/push-octopus-package-action@main with comment
• Update GitHub Actions versions:
  • actions/checkout to v4.1.1
  • actions/setup-dotnet to v4.0.0
  • actions/upload-artifact to v4.3.1
  • Particular/run-tests-action to v1.7.0
  • Particular/push-octopus-package-action to v2.0.0
  • azure/login to v2.0.0
  • Particular.Approvals to 0.3.0 if using 0.2.0
• Update build tool NuGet package versions in test projects:
  • GitHubActionsTestLogger to 2.3.3
  • Microsoft.NET.Test.Sdk to 17.9.0
  • NUnit to 3.14.0
  • NUnit3TestAdapter to 4.5.0

[DavidBoike]

~FYI, this may require a release.~ Nope, see below.

[DavidBoike]

Update: Although this PR had to change the component code itself to get all tests to pass, a new release isn't required.

The bug was due to a throw; out of a nested try/catch. When compiled with the 8.0 SDK, the throw begins throwing the outer exception, not the inner one, resulting in a different exception observed up the call stack.

But in this PR a test was conducted using the 1.1.1 package which was built using the .NET 7.0 SDK, and when using those bits, the tests all pass when executed on each of the 6.0, 7.0, and 8.0 runtimes, proving that the bug is a compiler bug, not a runtime bug, and all the previously-built packages are bug-free even when executed on the .NET 8 runtime.