Update CI SDK matrix for multi-targeting

Author: ANcpLua

.github/workflows/tests.yml

@@ -18,6 +18,8 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
+            8.0.x
+            9.0.x
             10.0.x
 
       - name: Restore dependencies
@@ -37,4 +39,4 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./SWEN3.Paperless.RabbitMq.Tests/TestResults/**/coverage.cobertura.xml
-          fail_ci_if_error: false
+          fail_ci_if_error: false