Enrollment in Catholic schools in Boston's Dorchester neighborhood had been falling for years, but now is rising after Catholic business leaders invested tens of millions of dollars refurbishing the schools. A group of businesspeople has raised $25 million toward the $67 million they have pledged. The money will enabled the archdiocese to consolidate, renovate, upgrade, and, in one instance, rebuild aging parish school buildings in the Dorchester and Mattapan neighborhoods.