Recover dotnet 3.1 for release CI (#602)

Author: mpreyskurantov

.github/workflows/ci.yml

@@ -91,7 +91,9 @@ jobs:
     - uses: actions/setup-dotnet@v3
       with:
         dotnet-quality: ga
-        dotnet-version: 6.0
+        dotnet-version: |
+          3.1
+          6.0
 
     - uses: actions/checkout@v3