[Snek] [keith-packard/snek] 24b8c1: .github: Update qemu to current custom versions

[Keith Packard]

  Branch: refs/heads/black-workflow
  Home:   https://github.com/keith-packard/snek
  Commit: 24b8c1ab67b82bed20357a123e342efb18f1061d
      https://github.com/keith-packard/snek/commit/24b8c1ab67b82bed20357a123e342efb18f1061d
  Author: Keith Packard <keithp at keithp.com>
  Date:   2020-11-03 (Tue, 03 Nov 2020)

  Changed paths:
    M .github/Dockerfile

  Log Message:
  -----------
  .github: Update qemu to current custom versions

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