We claim the ornamental design for a contact configuration, as shown and described.
FIG. 1 is a front perspective view of a contact configuration showing our new design; and,
FIG. 2 is a front elevation view thereof.
Any portion of the contact configuration depicted in broken lines forms no part of the claimed design. Broken lines formed by equal length dashes show unclaimed portions of the design. Broken lines formed of unequal length dashes (i.e., dash-dot) show boundaries between claimed and unclaimed portions of the design.