GPU: Change Type enum to use lower case values

This is to help for future resource declaration
using macros.

Rel #137261

Pull Request: https://projects.blender.org/blender/blender/pulls/137367

source/blender/python/gpu/gpu_py_shader.cc

@@ -739,7 +739,9 @@ static PyObject *pygpu_shader_attrs_info_get(BPyGPUShader *self, PyObject * /*ar
         continue;
       }
 
-      type = STREQ(name, "pos") ? int(Type::VEC3) : STREQ(name, "color") ? int(Type::VEC4) : -1;
+      type = STREQ(name, "pos")   ? int(Type::float3_t) :
+             STREQ(name, "color") ? int(Type::float4_t) :
+                                    -1;
       PyObject *py_type;
       if (type != -1) {
         py_type = PyUnicode_InternFromString(