[Svn] [roundcube/roundcubemail] d8d0f6: Travis: Disable php8.0snapshot use, it does not work

[Aleksander Machniak]

  Branch: refs/heads/dev/actions
  Home:   https://github.com/roundcube/roundcubemail
  Commit: d8d0f65ab2724913ad4292f9ac4ce46c6e84d504
      https://github.com/roundcube/roundcubemail/commit/d8d0f65ab2724913ad4292f9ac4ce46c6e84d504
  Author: Aleksander Machniak <alec at alec.pl>
  Date:   2020-11-01 (Sun, 01 Nov 2020)

  Changed paths:
    M .ci/install.sh
    M .travis.yml

  Log Message:
  -----------
  Travis: Disable php8.0snapshot use, it does not work