chore: Adds .NET 7 to release workflow (#1230)

.github/workflows/create-release.yml

@@ -14,6 +14,10 @@ jobs:
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
         token: ${{ secrets.WORKFLOW_TOKEN }}
+    - name: Setup .NET 7
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 7.0.100-rc.2.22477.23
     - name: Install NGBV
       uses: dotnet/nbgv@master
       id: nbgv