Last month’s unemployment rate ticked up to 12% from 11.8% in June, according to figures released Friday by the state Employment Development Department. California now has the second-highest rate of unemployment in the nation, trailing only Nevada at 12.9%. Its jobless rate is well above the U.S. average of 9.1% in July. The hiring picture was particularly bleak. California employers added just 4,500 new jobs last month, a steep drop from the revised 30,400 jobs added in June.