Revert to older SDK version due to bug in .NET > 9.0.200 on macOS

Author: pascalberger

.azuredevops/pipelines/templates/stages/unit-tests.yml

@@ -19,6 +19,10 @@ stages:
         vmImage: $(imageName)
       steps:
       - template: ../steps/install-required-dotnet-versions-for-building.yml 
+      - task: UseDotNet@2
+        inputs:
+          version: '9.0.101'
+        displayName: 'Install .NET 9'
       # Ubuntu 24.04 does not have Mono installed, which is Required for Cake.Recipe
       - bash: sudo apt-get install mono-complete
         condition: eq(variables['imageName'], 'ubuntu-24.04')

.github/workflows/unittests.yml

@@ -37,7 +37,7 @@ jobs:
           dotnet-version: | 
             5.x
             8.x
-            9.x
+            9.0.101
       # Ubuntu 24.04 does not have Mono installed, which is Required for Cake.Recipe
       - name: Install Mono
         if: ${{ matrix.os == 'ubuntu-24.04' }}