Parishioners at Catholic churches in the Archdiocese of Boston are boosting their donations to financially strapped parishes, according to the archdiocese’s annual financial report released yesterday. The report shows that parish collections and other fund-raising rose by about 4.5 percent, after several years of being flat or declining. Still, the annual budget document suggests looming fiscal problems for the archdiocese. About one-third of parishes operated in the red. And the church’s pension fund remains underfunded, with projected liabilities of nearly $96 million.