[devops] update pytorch version of CI

[ver217]

Overview

Our example tests and documentation tests use torch 1.12.0, see

ColossalAI/.github/workflows/example_check_on_pr.yml

Line 75 in f7361ee

image: hpcaitech/pytorch-cuda:1.12.0-11.3.0

.

However, out unit tests use torch 1.11.0, see

ColossalAI/.github/workflows/build_on_pr.yml

Line 71 in f7361ee

image: hpcaitech/pytorch-cuda:1.11.0-11.3.0

.

This inconsistency may lead to compatibility issue.

Goal

1. Update torch verion of CI to 1.12.0
2. Fix failed tests.