Add dpranke@ back as an OWNER.

Change-Id: I774348ae01769a0ea8e2032d66728e10dbb428fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4074124
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>

OWNERS

@@ -2,6 +2,7 @@ set noparent
 
 ajp@google.com
 aravindvasudev@google.com
+dpranke@google.com
 gavinmak@google.com
 jojwang@google.com
 sokcevic@google.com