OWNERS: move dlorenc to alumni
OWNERS: move dlorenc to alumni

Following the Contributor ladder[1], I am moving dlorenc to alumni
because of being inactive for a longer period.

[1]: https://github.com/tektoncd/community/blob/main/process.md#inactivity

Signed-off-by: Vincent Demeester <b98c0fd48a8945096c766de790fe70420dd2f223@redhat.com>

tektoncd/pipeline,tektoncd/pipeline