The ornamental design for the packaging machine, as shown and described.
FIG. 1 is a top front perspective view of the packaging machine;
FIG. 2 is a top rear perspective view of the packaging machine shown in FIG. 1;
FIG. 3 is a front plan view of the packaging machine shown in FIG. 1;
FIG. 4 is a left plan view of the packaging machine shown in FIG. 1;
FIG. 5 is a right plan view of the packaging machine shown in FIG. 1; and,
FIG. 6 is a top plan view of the packaging machine shown in FIG. 1.
The broken lines are included in FIG. 1 through 6 for the purpose of illustrating portions of the packaging machine that form no part of the claimed design.