Update mypy to version 0.931 / rev 26 via SR 948161
    
    https://build.opensuse.org/request/show/948161
    by user sebix + dimstar_suse
    - Skip teststubtest because we use a pytest-xdist version which is
      not allowed by upstream -- gh#python/mypy#11019 (forwarded request 948145 from bnavigator)