build-nuget-packages mention non-existing set-nuget-version-suffix step

[iskiselev]

In #2772 set-nuget-version-suffix step was removed, but it still mentioned at

opentelemetry-dotnet-instrumentation/.github/workflows/build-nuget-packages.yml

Line 23 in f1a15e0

nuget-version-suffix: ${{ steps.set-nuget-version-suffix.outputs.suffix }}

and

opentelemetry-dotnet-instrumentation/.github/workflows/build-nuget-packages.yml

Line 9 in f1a15e0

value: ${{ jobs.build-nuget-packages.outputs.nuget-version-suffix }}

Should it be cleaned up?