increases select type overload to 8 args

Author: GiorgioPorgio

scripts/generate_select.py

@@ -13,7 +13,7 @@
 destiny_path = Path(__file__).parent.parent / "sqlmodel/sql/_expression_select_gen.py"
 
 
-number_of_types = 4
+number_of_types = 8
 
 
 class Arg(BaseModel):