### 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
} else {
											if (precision2 != PRECISION_DEFAULT) {
												from += get_precision_name(precision2);
												from += " ";
											}
											from += get_datatype_name(type2);
										}
										from += "[";
										from += itos(array_size2);
										from += "]'";
										String to;
										if (type == TYPE_STRUCT) {
											to += struct_name;
										} else {
											if (precision != PRECISION_DEFAULT) {
												to += get_precision_name(precision);
												to += " ";
											}
											to += get_datatype_name(type);
										}
										to += "[";
										to += itos(constant.array_size);
										to += "]'";
										_set_error(vformat(RTR("Cannot convert from '%s' to '%s'."), from, to));
										return ERR_PARSE_ERROR;
									}
								}
								bool curly = tk.type == TK_CURLY_BRACKET_OPEN;
								if (unknown_size) {
									if (!curly) {