MILWAUKEE — A June series that pitted the two remaining teams vying for the NL Central title and started with both teams sporting the same record became a showcase of their bullpens. Call it a draw. The Milwaukee Brewers’ lockdown trio of reliever Brad Boxberger, setup man Devin Williams, and closer Josh Hader secured a 6-4 victory Thursday and a split of the four-game series at American Family Field. It was the second time in four days that Williams and Hader pitched the final two innings of a game to edge the Cardinals, and in the games bookended between those bullpen outings for the Brewers…