### Godot version

4.0.beta14

### System information

windows 10, gles 3, nvidia graphics

### Issue description

SCREEN_TEXTURE  was dropped in beta 14. The suggested replacement is to use ```uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmaps;```, but filter_linear_mipmaps is not recognized as a valid shader type hint and a shader using it fails to compile.

### Steps to reproduce

Create a canvas item shader and use the filter_linear_mipmaps type hint with a sampler2D uniform.

### Minimal reproduction project

N/A
#include "shader_language.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
#include "core/templates/local_vector.h"
#include "servers/rendering_server.h"
#include "shader_types.h"
#define HAS_WARNING(flag) (warning_flags & flag)
String ShaderLanguage::get_operator_text(Operator p_op) {