1. Changed autocaster due to new promotion rules

With "weak promotion" of python types in Numpy 2.0,
the statement `1.1 == np.asarray(1.1).astype('float32')` is True,
whereas in Numpy 1.26, it was false.

However, in numpy 1.26, `1.1 == np.asarray([1.1]).astype('float32')`
was true, so the scalar behavior and array behavior are the same
in Numpy 2.0, while they were different in numpy 1.26.

Essentially, in Numpy 2.0, if python floats are used in operations
with numpy floats or arrays, then the type of the numpy object will
be used (i.e. the python value will be treated as the type of the numpy
objects).

To preserve the behavior of `NumpyAutocaster` from numpy <= 1.26, I've
added an explicit conversion of the value to be converted to a numpy
type using `np.asarray` during the check that decides what dtype to
cast to.

2. Updates due to new numpy conversion rules for out-of-bounds python
ints

In numpy 2.0, out of bounds python ints will not be automatically
converted, and will raise an `OverflowError` instead.
For instance, converting 255 to int8 will raise an error, instead of
returning -1.

To explicitly force conversion, we must use
`np.asarray(value).astype(dtype)`, rather than
`np.asarray(value, dtype=dtype)`.

The code in `TensorType.filter` has been changed to the new recommended
way to downcast, and the error type caught by some tests has been
changed to OverflowError from TypeError