Move RentReturnRelease_SubsequentRentReturnsDifferentHandles out of process#1960

JimBobSquarePants merged 3 commits intomasterSixLabors/ImageSharp:masterfrom

af/externalize-RentReturnRelease_SubsequentRentReturnsDifferentHandlesSixLabors/ImageSharp:af/externalize-RentReturnRelease_SubsequentRentReturnsDifferentHandlesCopy head branch name to clipboard