Fix wpiutil tests

Author: virtuald

subprojects/robotpy-wpiutil/tests/cpp/wpiutil_test/sendable_test.cpp

@@ -18,8 +18,6 @@ class MySendableBuilder : public wpi::SendableBuilder {
 
   void SetActuator(bool value) override {}
 
-  void SetSafeState(std::function<void()> func) override {}
-
   void AddBooleanProperty(std::string_view key, std::function<bool()> getter,
                           std::function<void(bool)> setter) override {}