fixup: disable warning

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

Author: toddbaert

test/OpenFeature.Tests/OpenFeatureEventTests.cs

@@ -143,7 +143,9 @@ public void API_Level_Event_Handlers_Should_Be_Informed_About_Ready_State_After_
             var eventHandler = Substitute.For<EventHandlerDelegate>();
 
             var testProvider = new TestProvider();
+            #pragma warning disable CS0618 // Type or member is obsolete
             Api.Instance.SetProvider(testProvider);
+            #pragma warning restore CS0618 // Type or member is obsolete
 
             Api.Instance.AddHandler(ProviderEventTypes.ProviderReady, eventHandler);