The ornamental design for a giftpackage, as shown and described.
FIG. 1 is an unassembled bottom view of a gift package, according to my new design;
FIG. 2 is an unassembled top view thereof;
FIG. 3 is an assembled top perspective view thereof;
FIG. 4 is an assembled bottom perspective view thereof;
FIG. 5 is an unassembled side view thereof; and,
FIG. 6 is an unassembled top perspective view thereof.
In the drawings, the broken lines are for the purpose of illustrating environment only and form no part of the claimed design. Additionally, in some embodiments, any non-oblique line shading is meant to show contour of represented surfaces, not surface ornamentation.