### 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
for (const KeyValue<ShaderWarning::Code, HashMap<StringName, HashMap<StringName, Usage>> *> &E : warnings_check_map2) {
		for (const KeyValue<StringName, HashMap<StringName, Usage>> &T : *E.value) {
			for (const KeyValue<StringName, Usage> &U : T.value) {
				if (!U.value.used) {
					_add_warning(E.key, U.value.decl_line, U.key);
				}
			}
		}
	}
	for (const KeyValue<ShaderWarning::Code, HashMap<StringName, Usage> *> &E : warnings_check_map) {
		for (const KeyValue<StringName, Usage> &U : (*E.value)) {
			if (!U.value.used) {
				_add_warning(E.key, U.value.decl_line, U.key);
			}
		}
	}
}
List<ShaderWarning>::Element *ShaderLanguage::get_warnings_ptr() {
	return warnings.front();
}
void ShaderLanguage::enable_warning_checking(bool p_enabled) {
	check_warnings = p_enabled;
}
bool ShaderLanguage::is_warning_checking_enabled() const {