Change default target framework for test

Author: alex-kulakov

.github/workflows/reusable-storage-dependant-tests.yml

@@ -16,7 +16,7 @@ on:
       target_framework:
         description: 'Target framework'
         required: true
-        default: 'net6.0'
+        default: 'net8.0'
         type: string
       specific_sha:
         description: 'Commit SHA to checkout'

.github/workflows/reusable-storage-independant-tests.yml

@@ -11,7 +11,7 @@ on:
       target_framework:
         description: 'Target framework'
         required: true
-        default: 'net6.0'
+        default: 'net8.0'
         type: string
       test_output_verbosity:
         description: 'Verbosity for dotnet test command'