Update Dockerfile.gpu for the latest Tensorflow

[DenDen047]

The latest TensorFlow is supported only CUDA 11.0 and cuDNN SDK 8.0

Software requirements
The following NVIDIA® software must be installed on your system:

• NVIDIA® GPU drivers —CUDA® 11.0 requires 450.x or higher.
• CUDA® Toolkit —TensorFlow supports CUDA® 11 (TensorFlow >= 2.4.0)
• CUPTI ships with the CUDA® Toolkit.
• cuDNN SDK 8.0.4 cuDNN versions).
• (Optional) TensorRT 6.0 to improve latency and throughput for inference on some models.

https://www.tensorflow.org/install/gpu

[torzdf]

Thanks for doing this. I'm going to leave it open, as I have discovered a potential flaw in Faceswap code re: tf 2.4.

Also, I would quite like to update the base install to 2.4 (and hence 30xx cards) for all users, but am currently at the mercy of waiting for Conda.

[GravenCh]

Waiting for the Nvidia 30 series supports

[torzdf]

I'm sorry it has taken me so long to get around to this. Life has got in the way. I'm closing this PR as it currently conflicts, but I would welcome a PR updating our Docker (which I will look to merge quickly).