LONDON (Reuters) -British postal workers will hold four days of strikes in August and September in protest over pay, marking the latest announcement of industrial action in the country as workers demand wage rises to cope with soaring inflation. Rising prices and stagnant real wage growth has forced unions representing workers in industries including railways and airlines to strike or trigger industrial action as Britain faces its worst cost-of-living crisis in decades. The Communication Workers Union representing staff at postal group Royal Mail said more than 115,000 postal workers will go o…