free memory on detach (#8264)

Author: P-R-O-C-H-Y

cores/esp32/esp32-hal-ledc.c

@@ -63,6 +63,7 @@ static bool ledcDetachBus(void * bus){
     ledc_channel_handle_t handle = (ledc_channel_handle_t)bus;
     ledc_handle.used_channels &= ~(1UL << handle->channel);
     pinMatrixOutDetach(handle->pin, false, false);
+    free(handle);
     return true;
 }