launcher: fix version to latest

We've already released 2.7, and the next tag is 2.8, so this should
be pulled up to 2.8 so it'll stay in sync.

Change-Id: Id47bdbdb8050b29ea36442ac2149dd948648237f
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/268572
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: David Pursehouse <dpursehouse@digital.ai>