add openfeature sdk to goleak ignore in testutil

pkg/util/testutil/context_test.go

@@ -15,7 +15,10 @@ import (
 func TestMain(m *testing.M) {
 	// make sure we don't leak goroutines after tests in this package have
 	// finished, which means we haven't leaked contexts either
-	goleak.VerifyTestMain(m)
+	// (Except for goroutines running specific functions. If possible we should fix this.)
+	goleak.VerifyTestMain(m,
+		goleak.IgnoreTopFunction("github.com/open-feature/go-sdk/openfeature.(*eventExecutor).startEventListener.func1.1"),
+	)
 }
 
 func TestTestContextFunc(t *testing.T) {