[Snek] [keith-packard/snek] f80d1b: .github: Update qemu version to current build

[Keith Packard]

  Branch: refs/heads/check-ci
  Home:   https://github.com/keith-packard/snek
  Commit: f80d1ba22e83cd9330b70bfd55e4db849eb12759
      https://github.com/keith-packard/snek/commit/f80d1ba22e83cd9330b70bfd55e4db849eb12759
  Author: Keith Packard <keithp at keithp.com>
  Date:   2020-10-06 (Tue, 06 Oct 2020)

  Changed paths:
    M .github/Dockerfile

  Log Message:
  -----------
  .github: Update qemu version to current build

Signed-off-by: Keith Packard <keithp at keithp.com>