### 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
int idx = 0;
#define GETCHAR(m_idx) (((idx + m_idx) < p_code.length()) ? p_code[idx + m_idx] : char32_t(0))
	while (true) {
		if (GETCHAR(0) == '/' && GETCHAR(1) == '/') {
			idx += 2;
			while (true) {
				if (GETCHAR(0) == 0) {
					return 0;
				}
				if (GETCHAR(0) == '\n') {
					idx++;
					break; 
				}