Remove a redundant XMR test; Add weights_only argument for torch.load

[hallogameboy]

Issue #, if available:

Description of changes:

• Remove a redundant test that requires pulling external pre-trained models.
• Add the argumentweight_only=False for torch.load due to the change of default argument in PyTorch of later versions.
• Change the PyTest workflow of aarch64 to use ubuntu-22.04-arm instead of ubuntu-latest to avoid docker pulling errors.
• Add the include of cstdint at pecos/core/utils/file_util.hpp to avoid CodeQL errors.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.