The premier of the western German state of Rhineland-Palatinate, Malu Dreyer, announced her resignation on Wednesday. Dreyer, a Social Democrat who has led the state since 2013, said she no longer had the energy required for the job and would step down from the post in July. “I am leaving with a heavy heart because I am not tired of the job,” Dreyer said in Mainz, the state capital. But Dryer said the work has become draining and she must muster more and more energy for the job, which is pushing her to her limits. “I’m 63, so I’m not very old yet. But I have to admit to myself that it’s not th…