Update version naming in NuGet pack command

This commit changes how the version suffix is handled in the NuGet packing command of the Github workflow. The 'VersionSuffix' package property was replaced with a direct string concatenation to the 'Version' property achieving the same effect but providing an easier overview of the resulting package version.

.github/workflows/merge.yml

@@ -33,7 +33,7 @@ jobs:
         run: dotnet test --no-build --configuration Release --logger trx --results-directory TestResults
 
       - name: Pack NuGet Packages
-        run: dotnet pack --no-build --configuration Release --output nupkgs /p:Version=${{ steps.get_release.outputs.tag_name }} /p:VersionSuffix=preview
+        run: dotnet pack --no-build --configuration Release --output nupkgs /p:Version=${{ steps.get_release.outputs.tag_name }}-preview
 
       - name: Push NuGet Packages
         run: dotnet nuget push nupkgs/*.nupkg  -k ${{ secrets.nugetkey }} -s https://api.nuget.org/v3/index.json --skip-duplicate