### 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
String str;
					while (is_ascii_identifier_char(GETCHAR(0))) {
						str += char32_t(GETCHAR(0));
						char_idx++;
					}
					
					
					int idx = 0;
					while (keyword_list[idx].text) {
						if (str == keyword_list[idx].text) {
							return _make_token(keyword_list[idx].token);
						}
						idx++;
					}
					str = str.replace("dus_", "_");
					return _make_token(TK_IDENTIFIER, str);
				}
				if (GETCHAR(0) > 32) {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)) + ": '" + String::chr(GETCHAR(0)) + "'");
				} else {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)));
				}
			} break;
		}
	}
	ERR_PRINT("BUG");
	return Token();
#undef GETCHAR
}
bool ShaderLanguage::_lookup_next(Token &r_tk) {