Remove inheriting from object when creating classes with type()

[verhovsky]

Just as

class A(object): pass

is re-written as

class A: pass

, so should

A = type("A", (object,), {})

be re-written as

A = type("A", (), {})

See python/cpython#19553

[colin99d]

I am going to attempt this one. @asottile could you assign me?

[asottile]

I don't use the assign feature because if someone abandons working on it then it'll look like it's in progress forever and people will be discouraged from even attempting