Update publish-package.yml

change dotnet-version to 6.0.x

Author: JoeStrout

.github/workflows/publish-package.yml

@@ -62,7 +62,7 @@ jobs:
 
       - uses: actions/setup-dotnet@v2
         with:
-          dotnet-version: 5.0.x
+          dotnet-version: 6.0.x
 
       - name: Authenticate to Github Packages
         run: dotnet nuget add source --username "${{ github.repository_owner }}" --password "${{ secrets.GITHUB_TOKEN }}" --store-password-in-clear-text --name github "https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json"