message: gimbal integration tests: use explicit cast for float to unsigned int
  fixes a warning with MSVC.
diff: @@ -141,7 +141,7 @@ TEST_F(SitlTest, GimbalROIOffboard)
  // fly in north-south direction (back & forth a few times)
  const float step_size = 0.01f;
  const float one_cycle = 2.0f * M_PI_F;
  - const unsigned steps = 2.5f * one_cycle / step_size;
  + const unsigned steps = static_cast<unsigned>(2.5f * one_cycle / step_size);
  for (unsigned i = 0; i < steps; ++i) {
  float vx = 5.0f * sinf(i * step_size);
  