Improve ast types; revert several "redundant numeric union" changes from #7906 (#9130)

* Adapt number types in ast

Since mypy  0.990 type promotions was limited.
This means that complex is not longer promoted to int/float, therefore
we should adapt the types to list all possible types

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: AlexWaygood <alex.waygood@gmail.com>

stubs/typed-ast/typed_ast/ast27.pyi

@@ -238,7 +238,7 @@ class Repr(expr):
     value: expr
 
 class Num(expr):
-    n: complex
+    n: int | float | complex
 
 class Str(expr):
     s: str | bytes

stubs/typed-ast/typed_ast/ast3.pyi

@@ -257,7 +257,7 @@ class Call(expr):
     keywords: list[keyword]
 
 class Num(expr):
-    n: complex
+    n: int | float | complex
 
 class Str(expr):
     s: str