[recipes] Remove unnecessary depot_tools dependency in flavor module

Change-Id: Ic1f3896a450bd81bb8c4859d3998c9873af821f6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263016
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
1 file changed