### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

TkPos pre_pos = _get_tkpos();
	int line = pre_pos.tk_line;
	_get_token();
	Token tk = _get_token();
	_set_tkpos(pre_pos);
	if (tk.line == line) {
		r_tk = tk;
		return true;
	}
	return false;
}
String ShaderLanguage::token_debug(const String &p_code) {
	clear();
	code = p_code;
	String output;
	Token tk = _get_token();
	while (tk.type != TK_EOF && tk.type != TK_ERROR) {
		output += itos(tk_line) + ": " + get_token_text(tk) + "\n";
		tk = _get_token();
	}
	return output;
}
bool ShaderLanguage::is_token_variable_datatype(TokenType p_type) {