Fix VoxelGIData dynamic range property being treated as integer

Floating-point values are accepted as dynamic range settings.

This also clamps the lowest value to 1.0, as there's no practical
use case for going below 1.0 (it introduces clipping without
improving precision).

scene/3d/voxel_gi.cpp

@@ -227,7 +227,7 @@ void VoxelGIData::_bind_methods() {
 
 	ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "_data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_data", "_get_data");
 
-	ADD_PROPERTY(PropertyInfo(Variant::INT, "dynamic_range", PROPERTY_HINT_RANGE, "0,8,0.01"), "set_dynamic_range", "get_dynamic_range");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "dynamic_range", PROPERTY_HINT_RANGE, "1,8,0.01"), "set_dynamic_range", "get_dynamic_range");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "energy", PROPERTY_HINT_RANGE, "0,64,0.01"), "set_energy", "get_energy");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "bias", PROPERTY_HINT_RANGE, "0,8,0.01"), "set_bias", "get_bias");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "normal_bias", PROPERTY_HINT_RANGE, "0,8,0.01"), "set_normal_bias", "get_normal_bias");