Updated Dependencies and DockerFile

[Cyber-Machine]

Solves: #1201

I was trying to build the docker container, but it showed errors due to mismatched dependencies.

You do not have pycocotools installed, so KerasCV pycoco metrics are not available. Please run `pip install pycocotools`.

Also had to downgrade keras-cv as

RuntimeError: For project keras_cv, URL https://github.com/keras-team/keras-cv/tree/v0.3.4/ has version number 0.3.4 which does not match the current imported package version 0.4.1

Also had to get keras-nlp from the source as pip didn't have the latest version 0.4.0 available and had to upgrade python as keras-nlp doesn't support python:3.7.

[fchollet]

For the time being that's correct. Thanks!