The ornamental design for a lifting apparatus, as shown and described.
FIG. 1 is a perspective view of a lifting apparatus showing my new design.
FIG. 2 is a front view thereof;
FIG. 3 is a first side view thereof;
FIG. 4 is a second side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a back view thereof.
The broken line showing of various surface features is included for the purpose of illustrating portions of a lifting apparatus and forms no part of the claimed design.