Stale GPG Key in CUCHEM base docker file

[lilleswing]

Fixes issue https://github.com/NVIDIA/cheminformatics/issues/163.

When attempting to build the containers you get this issue building cuchem

W: GPG error: https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
E: The repository 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease' is not signed.

It seems related to this issue, about NVIDIA rotating their gpg keys. One can either remove the sources.list or possibly upgrade the base container.

[GPUtester]

Can one of the admins verify this patch?

Admins can comment ok to test to allow this one PR to run or add to allowlist to allow all future PRs from the same author to run.