pytorch=1.8.0 and torchvision=0.10.1 cannot be installed under a Linux build on the CI

For some reason, the versions of pytorch and torchvision current in conda_build_config.yaml cannot be installed alongside the remainder of the packages, at least for bob.ip.binseg:

• https://gitlab.idiap.ch/bob/bob.ip.binseg/-/jobs/246120

It states:

The reported errors are:
    Encountered problems while solving:
      - nothing provides __glibc >=2.17,<3.0.a0 needed by torchvision-0.10.1-py36cuda102hd220d44_0_cuda
      - nothing provides __glibc >=2.17,<3.0.a0 needed by pytorch-1.8.0-cpu_py36h2d15a6b_1

Which is weird, because it is a python=3.8 build!