feat: Updates to .NET 8. (#1542)

### Breaking Changes
- Updating to .NET 8 - Required O/S's have slightly changed.

.github/workflows/create-release.yml

@@ -14,10 +14,10 @@ jobs:
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
-    - name: Setup .NET 7
+    - name: Setup .NET 8
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Install NGBV
       uses: dotnet/nbgv@master
       id: nbgv