fix actions for missing dotnet 8 sdk (#163)

Author: ElderJames

.github/workflows/release.yml

@@ -29,6 +29,10 @@ jobs:
         with:
           dotnet-version: 7.0.100
 
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 8.0.100
+
       - uses: actions/setup-node@v1
         with:
           node-version: "10.x"