By Dan Weil The 30-year fixed-rate mortgage averaged 5.09% in the week ended June 2, up from 2.99% a year earlier. A lack of housing inventory has represented one of the biggest problems confronting potential home buyers during the covid pandemic. Now, some progress on that front has arrived. The inventory of homes with active listings jumped 8% in May from a year earlier, Realtor.com reports. More new listings entered the market in May than in any other month since June 2019. To be sure, active-listed inventories remain down — fully 48.5% from May 2020, about two months into the pandemic. An…