### Godot version

0810ecaafdbee3ea747219e6ab3a8de5d2216a09

### System information

Windows 11, Nvidia 3000, firefox

### Issue description

Exporting the gltf file is corrupt in blender.

### Steps to reproduce

1. Open project.
2. Export as glb
3. Open in blender
4. Blender display many warnings

![image](https://user-images.githubusercontent.com/32321/216740742-de662c5c-f5c3-44b5-a36e-8ad33defdbba.png)


### Minimal reproduction project

https://cdn.discordapp.com/attachments/598003845657788438/1071249610896580691/Test_Game_Project.zip


String interp = "LINEAR";
	if (p_interp == GLTFAnimation::INTERP_STEP) {
		interp = "STEP";
	} else if (p_interp == GLTFAnimation::INTERP_LINEAR) {
		interp = "LINEAR";
	} else if (p_interp == GLTFAnimation::INTERP_CATMULLROMSPLINE) {
		interp = "CATMULLROMSPLINE";
	} else if (p_interp == GLTFAnimation::INTERP_CUBIC_SPLINE) {
		interp = "CUBICSPLINE";
	}
	return interp;
}
Error GLTFDocument::_serialize_animations(Ref<GLTFState> p_state) {
	if (!p_state->animation_players.size()) {
		return OK;
	}
	for (int32_t player_i = 0; player_i < p_state->animation_players.size(); player_i++) {
		List<StringName> animation_names;
		AnimationPlayer *animation_player = p_state->animation_players[player_i];
		animation_player->get_animation_list(&animation_names);
		if (animation_names.size()) {
			for (int animation_name_i = 0; animation_name_i < animation_names.size(); animation_name_i++) {
				_convert_animation(p_state, animation_player, animation_names[animation_name_i]);
			}