Fix nightly docker publish build
The build-publish-docker step is broken because
```
docker.io/nvidia/cuda:11.3-cudnn8-devel-ubuntu18.04
```
should be
```
docker.io/nvidia/cuda:11.3.0-cudnn8-devel-ubuntu18.04
```
See https://hub.docker.com/r/nvidia/cuda/tags?page=1&ordering=-name&name=11.3
The regression was introduced by https://github.com/pytorch/pytorch/commit/197764b35db68dee21ccc542d88a338f813623e7
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73918
Approved by: https://github.com/seemethere
