[CLIPSeg] Fix integration test
# What does this PR do?

A user reported at https://github.com/timojl/clipseg/issues/18 that CLIPSeg uses the ImageNet mean + std instead of the [-1, 1] range for normalization. This PR updates the integration test as repos on the hub were fixed.
_The documentation is not available anymore as the PR was closed or merged._<|||||>Yes, it uses `ViTImageProcessor` with different settings.