More than 45,000 U.S. dockworkers represented by the International Longshoremen's Association ratified a new six-year contract on Tuesday, formalizing a deal that offers bumper pay hikes and averts any potential disruption until 2030.Terms of the contract, previously agreed upon by the labor union and the United States Maritime Alliance, included a 62% wage hike over the life of the agreement.Both the labor union and the employer group had agreed on the wages in October, putting…