By Daina Beth Solomon MEXICO CITY (Reuters) – Workers at Volkswagen AG’s main Mexico factory have rejected their own union’s deal with management for a 9% pay raise, setting the stage for further talks just as inflation hits a 22-year high. Volkswagen de Mexico on Tuesday said it was committed to “constructive dialogue” with the union after the unexpected rejection in a vote last week on what would have been the biggest automaker raise in Mexico in recent years. The plant’s Independent Union of Automotive Workers (SITIAVW) last month announced the proposed raise for its 7,000 workers in the ce…