DEPS: use our mirror for Nima-Cpp

Change-Id: I6d4b688407a6b60e2d672d97bc91816f7212e1bf
Reviewed-on: https://skia-review.googlesource.com/c/186871
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed