Retarget GTX960 jobs to new drivers.

2/4 of the machines upgraded their drivers, confirmed jobs work on
updated machines and upgraded 1 of the outdated machines to match.
Will upgrade the last one after this lands.

Change-Id: Ib1485767733b3907d0bac3d6c341fa8e434aa0c6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/375614
Commit-Queue: Weston Tracey <westont@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
2 files changed