Very little movement near the top of our ra Cal’s victory over Arizona has vaulted the Golden Bears two spots to a season-high No. 8 in our SI Pac-12 Football Power Rankings. Cal had gone back and forth at ninth and 10th through the first four weeks of ranking, compiled through votes from seven sites who cover Pac-12 schools for the SI network. But a 49-31 win over the Wildcats, including a 28-7 second-half surge, vaulted Cal to eighth. The Bears play Saturday at Washington State, which dropped one spot to No. 7 after its 44-41 loss to Oregon last…